diff --git a/src/main/java/org/codelibs/fess/es/client/FessEsClient.java b/src/main/java/org/codelibs/fess/es/client/FessEsClient.java
index aa97777f6..5c5c9d28b 100644
--- a/src/main/java/org/codelibs/fess/es/client/FessEsClient.java
+++ b/src/main/java/org/codelibs/fess/es/client/FessEsClient.java
@@ -404,6 +404,8 @@ public class FessEsClient implements Client {
             }
             source = source.replaceAll(Pattern.quote("${fess.dictionary.path}"), dictionaryPath);
             source = source.replaceAll(Pattern.quote("${fess.index.codec}"), fessConfig.getIndexCodec());
+            source = source.replaceAll(Pattern.quote("${fess.index.number_of_shards}"), fessConfig.getIndexNumberOfShards());
+            source = source.replaceAll(Pattern.quote("${fess.index.auto_expand_replicas}"), fessConfig.getIndexAutoExpandReplicas());
             final CreateIndexResponse indexResponse =
                     client.admin().indices().prepareCreate(indexName).setSource(source, XContentType.JSON).execute()
                             .actionGet(fessConfig.getIndexIndicesTimeout());
diff --git a/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java b/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java
index 1726fac6d..a707302d0 100644
--- a/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java
+++ b/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java
@@ -362,6 +362,12 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
     /** The key of the configuration. e.g. default */
     String INDEX_CODEC = "index.codec";
 
+    /** The key of the configuration. e.g. 5 */
+    String INDEX_number_of_shards = "index.number_of_shards";
+
+    /** The key of the configuration. e.g. 0-1 */
+    String INDEX_auto_expand_replicas = "index.auto_expand_replicas";
+
     /** The key of the configuration. e.g. favorite_count */
     String INDEX_FIELD_favorite_count = "index.field.favorite_count";
 
@@ -2444,6 +2450,28 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
      */
     String getIndexCodec();
 
+    /**
+     * Get the value for the key 'index.number_of_shards'. <br>
+     * The value is, e.g. 5 <br>
+     * @return The value of found property. (NotNull: if not found, exception but basically no way)
+     */
+    String getIndexNumberOfShards();
+
+    /**
+     * Get the value for the key 'index.number_of_shards' as {@link Integer}. <br>
+     * The value is, e.g. 5 <br>
+     * @return The value of found property. (NotNull: if not found, exception but basically no way)
+     * @throws NumberFormatException When the property is not integer.
+     */
+    Integer getIndexNumberOfShardsAsInteger();
+
+    /**
+     * Get the value for the key 'index.auto_expand_replicas'. <br>
+     * The value is, e.g. 0-1 <br>
+     * @return The value of found property. (NotNull: if not found, exception but basically no way)
+     */
+    String getIndexAutoExpandReplicas();
+
     /**
      * Get the value for the key 'index.field.favorite_count'. <br>
      * The value is, e.g. favorite_count <br>
@@ -6249,6 +6277,18 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
             return get(FessConfig.INDEX_CODEC);
         }
 
+        public String getIndexNumberOfShards() {
+            return get(FessConfig.INDEX_number_of_shards);
+        }
+
+        public Integer getIndexNumberOfShardsAsInteger() {
+            return getAsInteger(FessConfig.INDEX_number_of_shards);
+        }
+
+        public String getIndexAutoExpandReplicas() {
+            return get(FessConfig.INDEX_auto_expand_replicas);
+        }
+
         public String getIndexFieldFavoriteCount() {
             return get(FessConfig.INDEX_FIELD_favorite_count);
         }
@@ -8100,6 +8140,8 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
             defaultMap.put(FessConfig.INDEXER_DATA_MAX_DOCUMENT_CACHE_SIZE, "5");
             defaultMap.put(FessConfig.INDEXER_DATA_MAX_DOCUMENT_REQUEST_SIZE, "10485760");
             defaultMap.put(FessConfig.INDEX_CODEC, "default");
+            defaultMap.put(FessConfig.INDEX_number_of_shards, "5");
+            defaultMap.put(FessConfig.INDEX_auto_expand_replicas, "0-1");
             defaultMap.put(FessConfig.INDEX_FIELD_favorite_count, "favorite_count");
             defaultMap.put(FessConfig.INDEX_FIELD_click_count, "click_count");
             defaultMap.put(FessConfig.INDEX_FIELD_config_id, "config_id");
diff --git a/src/main/resources/fess_config.properties b/src/main/resources/fess_config.properties
index d66d442a9..e4a8bceb0 100644
--- a/src/main/resources/fess_config.properties
+++ b/src/main/resources/fess_config.properties
@@ -207,6 +207,8 @@ indexer.data.max.document.request.size=10485760
 
 # index setting
 index.codec=default
+index.number_of_shards=5
+index.auto_expand_replicas=0-1
 
 # field names
 index.field.favorite_count=favorite_count
diff --git a/src/main/resources/fess_indices/.fess_config.access_token.json b/src/main/resources/fess_indices/.fess_config.access_token.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.access_token.json
+++ b/src/main/resources/fess_indices/.fess_config.access_token.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.bad_word.json b/src/main/resources/fess_indices/.fess_config.bad_word.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.bad_word.json
+++ b/src/main/resources/fess_indices/.fess_config.bad_word.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.boost_document_rule.json b/src/main/resources/fess_indices/.fess_config.boost_document_rule.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.boost_document_rule.json
+++ b/src/main/resources/fess_indices/.fess_config.boost_document_rule.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.crawling_info.json b/src/main/resources/fess_indices/.fess_config.crawling_info.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.crawling_info.json
+++ b/src/main/resources/fess_indices/.fess_config.crawling_info.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.crawling_info_param.json b/src/main/resources/fess_indices/.fess_config.crawling_info_param.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.crawling_info_param.json
+++ b/src/main/resources/fess_indices/.fess_config.crawling_info_param.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.data_config.json b/src/main/resources/fess_indices/.fess_config.data_config.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.data_config.json
+++ b/src/main/resources/fess_indices/.fess_config.data_config.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.data_config_to_label.json b/src/main/resources/fess_indices/.fess_config.data_config_to_label.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.data_config_to_label.json
+++ b/src/main/resources/fess_indices/.fess_config.data_config_to_label.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.data_config_to_role.json b/src/main/resources/fess_indices/.fess_config.data_config_to_role.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.data_config_to_role.json
+++ b/src/main/resources/fess_indices/.fess_config.data_config_to_role.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.duplicate_host.json b/src/main/resources/fess_indices/.fess_config.duplicate_host.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.duplicate_host.json
+++ b/src/main/resources/fess_indices/.fess_config.duplicate_host.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.elevate_word.json b/src/main/resources/fess_indices/.fess_config.elevate_word.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.elevate_word.json
+++ b/src/main/resources/fess_indices/.fess_config.elevate_word.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.elevate_word_to_label.json b/src/main/resources/fess_indices/.fess_config.elevate_word_to_label.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.elevate_word_to_label.json
+++ b/src/main/resources/fess_indices/.fess_config.elevate_word_to_label.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.failure_url.json b/src/main/resources/fess_indices/.fess_config.failure_url.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.failure_url.json
+++ b/src/main/resources/fess_indices/.fess_config.failure_url.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.file_authentication.json b/src/main/resources/fess_indices/.fess_config.file_authentication.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.file_authentication.json
+++ b/src/main/resources/fess_indices/.fess_config.file_authentication.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.file_config.json b/src/main/resources/fess_indices/.fess_config.file_config.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.file_config.json
+++ b/src/main/resources/fess_indices/.fess_config.file_config.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.file_config_to_label.json b/src/main/resources/fess_indices/.fess_config.file_config_to_label.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.file_config_to_label.json
+++ b/src/main/resources/fess_indices/.fess_config.file_config_to_label.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.file_config_to_role.json b/src/main/resources/fess_indices/.fess_config.file_config_to_role.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.file_config_to_role.json
+++ b/src/main/resources/fess_indices/.fess_config.file_config_to_role.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.job_log.json b/src/main/resources/fess_indices/.fess_config.job_log.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.job_log.json
+++ b/src/main/resources/fess_indices/.fess_config.job_log.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.key_match.json b/src/main/resources/fess_indices/.fess_config.key_match.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.key_match.json
+++ b/src/main/resources/fess_indices/.fess_config.key_match.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.label_to_role.json b/src/main/resources/fess_indices/.fess_config.label_to_role.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.label_to_role.json
+++ b/src/main/resources/fess_indices/.fess_config.label_to_role.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.label_type.json b/src/main/resources/fess_indices/.fess_config.label_type.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.label_type.json
+++ b/src/main/resources/fess_indices/.fess_config.label_type.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.path_mapping.json b/src/main/resources/fess_indices/.fess_config.path_mapping.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.path_mapping.json
+++ b/src/main/resources/fess_indices/.fess_config.path_mapping.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.related_content.json b/src/main/resources/fess_indices/.fess_config.related_content.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.related_content.json
+++ b/src/main/resources/fess_indices/.fess_config.related_content.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.related_query.json b/src/main/resources/fess_indices/.fess_config.related_query.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.related_query.json
+++ b/src/main/resources/fess_indices/.fess_config.related_query.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.request_header.json b/src/main/resources/fess_indices/.fess_config.request_header.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.request_header.json
+++ b/src/main/resources/fess_indices/.fess_config.request_header.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.role_type.json b/src/main/resources/fess_indices/.fess_config.role_type.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.role_type.json
+++ b/src/main/resources/fess_indices/.fess_config.role_type.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.scheduled_job.json b/src/main/resources/fess_indices/.fess_config.scheduled_job.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.scheduled_job.json
+++ b/src/main/resources/fess_indices/.fess_config.scheduled_job.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.thumbnail_queue.json b/src/main/resources/fess_indices/.fess_config.thumbnail_queue.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.thumbnail_queue.json
+++ b/src/main/resources/fess_indices/.fess_config.thumbnail_queue.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.web_authentication.json b/src/main/resources/fess_indices/.fess_config.web_authentication.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.web_authentication.json
+++ b/src/main/resources/fess_indices/.fess_config.web_authentication.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.web_config.json b/src/main/resources/fess_indices/.fess_config.web_config.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.web_config.json
+++ b/src/main/resources/fess_indices/.fess_config.web_config.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.web_config_to_label.json b/src/main/resources/fess_indices/.fess_config.web_config_to_label.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.web_config_to_label.json
+++ b/src/main/resources/fess_indices/.fess_config.web_config_to_label.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_config.web_config_to_role.json b/src/main/resources/fess_indices/.fess_config.web_config_to_role.json
index def7bad83..d4d25b889 100644
--- a/src/main/resources/fess_indices/.fess_config.web_config_to_role.json
+++ b/src/main/resources/fess_indices/.fess_config.web_config_to_role.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 2,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_user.group.json b/src/main/resources/fess_indices/.fess_user.group.json
index 095b0fe6a..8e0985611 100644
--- a/src/main/resources/fess_indices/.fess_user.group.json
+++ b/src/main/resources/fess_indices/.fess_user.group.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 5,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_user.role.json b/src/main/resources/fess_indices/.fess_user.role.json
index 095b0fe6a..8e0985611 100644
--- a/src/main/resources/fess_indices/.fess_user.role.json
+++ b/src/main/resources/fess_indices/.fess_user.role.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 5,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/.fess_user.user.json b/src/main/resources/fess_indices/.fess_user.user.json
index 095b0fe6a..8e0985611 100644
--- a/src/main/resources/fess_indices/.fess_user.user.json
+++ b/src/main/resources/fess_indices/.fess_user.user.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 5,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/fess.json b/src/main/resources/fess_indices/fess.json
index 838f6fece..e504cfa2a 100644
--- a/src/main/resources/fess_indices/fess.json
+++ b/src/main/resources/fess_indices/fess.json
@@ -3,8 +3,9 @@
     "index": {
       "codec": "${fess.index.codec}",
       "refresh_interval": "1s",
-      "number_of_shards": 5,
-      "number_of_replicas": 0
+      "number_of_shards": "${fess.index.number_of_shards}",
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "${fess.index.auto_expand_replicas}"
     },
     "analysis": {
       "char_filter": {
diff --git a/src/main/resources/fess_indices/fess_log.click_log.json b/src/main/resources/fess_indices/fess_log.click_log.json
index e3657f0d6..13a336d0b 100644
--- a/src/main/resources/fess_indices/fess_log.click_log.json
+++ b/src/main/resources/fess_indices/fess_log.click_log.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 10,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/fess_log.favorite_log.json b/src/main/resources/fess_indices/fess_log.favorite_log.json
index e3657f0d6..13a336d0b 100644
--- a/src/main/resources/fess_indices/fess_log.favorite_log.json
+++ b/src/main/resources/fess_indices/fess_log.favorite_log.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 10,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/fess_log.search_log.json b/src/main/resources/fess_indices/fess_log.search_log.json
index e3657f0d6..13a336d0b 100644
--- a/src/main/resources/fess_indices/fess_log.search_log.json
+++ b/src/main/resources/fess_indices/fess_log.search_log.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 10,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }
diff --git a/src/main/resources/fess_indices/fess_log.user_info.json b/src/main/resources/fess_indices/fess_log.user_info.json
index e3657f0d6..13a336d0b 100644
--- a/src/main/resources/fess_indices/fess_log.user_info.json
+++ b/src/main/resources/fess_indices/fess_log.user_info.json
@@ -3,7 +3,8 @@
     "index": {
       "refresh_interval": "1s",
       "number_of_shards": 10,
-      "number_of_replicas": 0
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1"
     }
   }
 }