diff --git a/src/main/java/org/codelibs/fess/app/service/SearchService.java b/src/main/java/org/codelibs/fess/app/service/SearchService.java
index 9fb30ed98..8ac5fc4c2 100644
--- a/src/main/java/org/codelibs/fess/app/service/SearchService.java
+++ b/src/main/java/org/codelibs/fess/app/service/SearchService.java
@@ -107,7 +107,7 @@ public class SearchService {
         final String sortField = params.getSort();
         final List<Map<String, Object>> documentItems =
                 fessEsClient.search(
-                        fessConfig.getIndexDocumentIndex(),
+                        fessConfig.getIndexDocumentSearchIndex(),
                         fessConfig.getIndexDocumentType(),
                         searchRequestBuilder -> {
                             if (StringUtil.isNotBlank(sortField)) {
@@ -188,7 +188,7 @@ public class SearchService {
         final QueryContext queryContext = queryHelper.build(query, context -> {
             context.skipRoleQuery();
         });
-        return fessEsClient.deleteByQuery(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(),
+        return fessEsClient.deleteByQuery(fessConfig.getIndexDocumentUpdateIndex(), fessConfig.getIndexDocumentType(),
                 queryContext.getQueryBuilder());
     }
 
@@ -286,7 +286,7 @@ public class SearchService {
     }
 
     public OptionalEntity<Map<String, Object>> getDocumentByDocId(final String docId, final String[] fields) {
-        return fessEsClient.getDocument(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(), builder -> {
+        return fessEsClient.getDocument(fessConfig.getIndexDocumentSearchIndex(), fessConfig.getIndexDocumentType(), builder -> {
             builder.setQuery(QueryBuilders.termQuery(fessConfig.getIndexFieldDocId(), docId));
             builder.addFields(fields);
             return true;
@@ -294,7 +294,7 @@ public class SearchService {
     }
 
     public List<Map<String, Object>> getDocumentListByDocIds(final String[] docIds, final String[] fields) {
-        return fessEsClient.getDocumentList(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(), builder -> {
+        return fessEsClient.getDocumentList(fessConfig.getIndexDocumentSearchIndex(), fessConfig.getIndexDocumentType(), builder -> {
             builder.setQuery(QueryBuilders.termsQuery(fessConfig.getIndexFieldDocId(), docIds));
             builder.setSize(fessConfig.getPagingSearchPageMaxSizeAsInteger().intValue());
             builder.addFields(fields);
@@ -303,13 +303,13 @@ public class SearchService {
     }
 
     public boolean update(final String id, final String field, final Object value) {
-        return fessEsClient.update(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(), id, field, value);
+        return fessEsClient.update(fessConfig.getIndexDocumentUpdateIndex(), fessConfig.getIndexDocumentType(), id, field, value);
     }
 
     public boolean update(final String id, final Consumer<UpdateRequestBuilder> builderLambda) {
         try {
             final UpdateRequestBuilder builder =
-                    fessEsClient.prepareUpdate(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(), id);
+                    fessEsClient.prepareUpdate(fessConfig.getIndexDocumentUpdateIndex(), fessConfig.getIndexDocumentType(), id);
             builderLambda.accept(builder);
             final UpdateResponse response = builder.execute().actionGet();
             return response.isCreated();
diff --git a/src/main/java/org/codelibs/fess/app/web/admin/searchlist/AdminSearchlistAction.java b/src/main/java/org/codelibs/fess/app/web/admin/searchlist/AdminSearchlistAction.java
index 7df4ae545..9091e02df 100644
--- a/src/main/java/org/codelibs/fess/app/web/admin/searchlist/AdminSearchlistAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/admin/searchlist/AdminSearchlistAction.java
@@ -198,7 +198,7 @@ public class AdminSearchlistAction extends FessAdminAction {
         }
         try {
             final QueryBuilder query = QueryBuilders.termQuery(fessConfig.getIndexFieldDocId(), docId);
-            fessEsClient.deleteByQuery(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(), query);
+            fessEsClient.deleteByQuery(fessConfig.getIndexDocumentUpdateIndex(), fessConfig.getIndexDocumentType(), query);
             saveInfo(messages -> messages.addSuccessDeleteDocFromIndex(GLOBAL));
         } catch (final Exception e) {
             throwValidationError(messages -> messages.addErrorsFailedToDeleteDocInAdmin(GLOBAL), () -> asListHtml());
diff --git a/src/main/java/org/codelibs/fess/app/web/cache/CacheAction.java b/src/main/java/org/codelibs/fess/app/web/cache/CacheAction.java
index 1c6ea50e9..cc719e2b3 100644
--- a/src/main/java/org/codelibs/fess/app/web/cache/CacheAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/cache/CacheAction.java
@@ -51,12 +51,14 @@ public class CacheAction extends FessSearchAction {
 
         Map<String, Object> doc = null;
         try {
-            doc = fessEsClient.getDocument(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(), queryRequestBuilder -> {
-                final TermQueryBuilder termQuery = QueryBuilders.termQuery(fessConfig.getIndexFieldDocId(), form.docId);
-                queryRequestBuilder.setQuery(termQuery);
-                queryRequestBuilder.addFields(queryHelper.getCacheResponseFields());
-                return true;
-            }).get();
+            doc =
+                    fessEsClient.getDocument(fessConfig.getIndexDocumentSearchIndex(), fessConfig.getIndexDocumentType(),
+                            queryRequestBuilder -> {
+                                final TermQueryBuilder termQuery = QueryBuilders.termQuery(fessConfig.getIndexFieldDocId(), form.docId);
+                                queryRequestBuilder.setQuery(termQuery);
+                                queryRequestBuilder.addFields(queryHelper.getCacheResponseFields());
+                                return true;
+                            }).get();
         } catch (final Exception e) {
             logger.warn("Failed to request: " + form.docId, e);
         }
diff --git a/src/main/java/org/codelibs/fess/app/web/go/GoAction.java b/src/main/java/org/codelibs/fess/app/web/go/GoAction.java
index 71d7be67e..682223bff 100644
--- a/src/main/java/org/codelibs/fess/app/web/go/GoAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/go/GoAction.java
@@ -68,12 +68,14 @@ public class GoAction extends FessSearchAction {
 
         Map<String, Object> doc = null;
         try {
-            doc = fessEsClient.getDocument(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(), queryRequestBuilder -> {
-                final TermQueryBuilder termQuery = QueryBuilders.termQuery(fessConfig.getIndexFieldDocId(), form.docId);
-                queryRequestBuilder.setQuery(termQuery);
-                queryRequestBuilder.addFields(fessConfig.getIndexFieldUrl());
-                return true;
-            }).get();
+            doc =
+                    fessEsClient.getDocument(fessConfig.getIndexDocumentSearchIndex(), fessConfig.getIndexDocumentType(),
+                            queryRequestBuilder -> {
+                                final TermQueryBuilder termQuery = QueryBuilders.termQuery(fessConfig.getIndexFieldDocId(), form.docId);
+                                queryRequestBuilder.setQuery(termQuery);
+                                queryRequestBuilder.addFields(fessConfig.getIndexFieldUrl());
+                                return true;
+                            }).get();
         } catch (final Exception e) {
             logger.warn("Failed to request: " + form.docId, e);
         }
diff --git a/src/main/java/org/codelibs/fess/app/web/screenshot/ScreenshotAction.java b/src/main/java/org/codelibs/fess/app/web/screenshot/ScreenshotAction.java
index c07c06328..c080288ce 100644
--- a/src/main/java/org/codelibs/fess/app/web/screenshot/ScreenshotAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/screenshot/ScreenshotAction.java
@@ -65,7 +65,7 @@ public class ScreenshotAction extends FessSearchAction {
         BufferedInputStream in = null;
         try {
             final Map<String, Object> doc =
-                    fessEsClient.getDocument(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(),
+                    fessEsClient.getDocument(fessConfig.getIndexDocumentSearchIndex(), fessConfig.getIndexDocumentType(),
                             queryRequestBuilder -> {
                                 final TermQueryBuilder termQuery = QueryBuilders.termQuery(fessConfig.getIndexFieldDocId(), form.docId);
                                 queryRequestBuilder.setQuery(termQuery);
diff --git a/src/main/java/org/codelibs/fess/helper/CrawlingInfoHelper.java b/src/main/java/org/codelibs/fess/helper/CrawlingInfoHelper.java
index 96cd4e8f9..e3371e791 100644
--- a/src/main/java/org/codelibs/fess/helper/CrawlingInfoHelper.java
+++ b/src/main/java/org/codelibs/fess/helper/CrawlingInfoHelper.java
@@ -161,7 +161,7 @@ public class CrawlingInfoHelper implements Serializable {
     public List<Map<String, String>> getSessionIdList(final FessEsClient fessEsClient) {
         final FessConfig fessConfig = ComponentUtil.getFessConfig();
         return fessEsClient.search(
-                fessConfig.getIndexDocumentIndex(),
+                fessConfig.getIndexDocumentSearchIndex(),
                 fessConfig.getIndexDocumentType(),
                 queryRequestBuilder -> {
                     queryRequestBuilder.setQuery(QueryBuilders.matchAllQuery());
diff --git a/src/main/java/org/codelibs/fess/helper/DataIndexHelper.java b/src/main/java/org/codelibs/fess/helper/DataIndexHelper.java
index d870539c0..41c28e23f 100644
--- a/src/main/java/org/codelibs/fess/helper/DataIndexHelper.java
+++ b/src/main/java/org/codelibs/fess/helper/DataIndexHelper.java
@@ -258,8 +258,8 @@ public class DataIndexHelper implements Serializable {
                     QueryBuilders.boolQuery().must(QueryBuilders.termQuery(fessConfig.getIndexFieldConfigId(), dataConfig.getConfigId()))
                             .mustNot(QueryBuilders.termQuery(fessConfig.getIndexFieldSegment(), sessionId));
             try {
-                ComponentUtil.getElasticsearchClient().deleteByQuery(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(),
-                        queryBuilder);
+                ComponentUtil.getElasticsearchClient().deleteByQuery(fessConfig.getIndexDocumentUpdateIndex(),
+                        fessConfig.getIndexDocumentType(), queryBuilder);
             } catch (final Exception e) {
                 logger.error("Could not delete old docs at " + dataConfig, e);
             }
diff --git a/src/main/java/org/codelibs/fess/helper/IndexingHelper.java b/src/main/java/org/codelibs/fess/helper/IndexingHelper.java
index 7a831190d..df64f2062 100644
--- a/src/main/java/org/codelibs/fess/helper/IndexingHelper.java
+++ b/src/main/java/org/codelibs/fess/helper/IndexingHelper.java
@@ -46,7 +46,7 @@ public class IndexingHelper {
             synchronized (fessEsClient) {
                 deleteOldDocuments(fessEsClient, docList);
                 final FessConfig fessConfig = ComponentUtil.getFessConfig();
-                fessEsClient.addAll(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(), docList);
+                fessEsClient.addAll(fessConfig.getIndexDocumentUpdateIndex(), fessConfig.getIndexDocumentType(), docList);
             }
             if (logger.isInfoEnabled()) {
                 logger.info("Sent " + docList.size() + " docs (" + (System.currentTimeMillis() - execTime) + "ms)");
@@ -93,7 +93,7 @@ public class IndexingHelper {
             }
         }
         if (!docIdList.isEmpty()) {
-            fessEsClient.deleteByQuery(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(),
+            fessEsClient.deleteByQuery(fessConfig.getIndexDocumentUpdateIndex(), fessConfig.getIndexDocumentType(),
                     QueryBuilders.idsQuery(fessConfig.getIndexDocumentType()).ids(docIdList.stream().toArray(n -> new String[n])));
 
         }
@@ -101,20 +101,21 @@ public class IndexingHelper {
 
     public void deleteDocument(final FessEsClient fessEsClient, final String id) {
         final FessConfig fessConfig = ComponentUtil.getFessConfig();
-        fessEsClient.delete(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(), id, 0);
+        fessEsClient.delete(fessConfig.getIndexDocumentUpdateIndex(), fessConfig.getIndexDocumentType(), id, 0);
     }
 
     public void deleteDocumentsByDocId(final FessEsClient fessEsClient, final List<String> docIdList) {
         final FessConfig fessConfig = ComponentUtil.getFessConfig();
-        fessEsClient.deleteByQuery(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(),
+        fessEsClient.deleteByQuery(fessConfig.getIndexDocumentUpdateIndex(), fessConfig.getIndexDocumentType(),
                 QueryBuilders.idsQuery(fessConfig.getIndexDocumentType()).ids(docIdList.stream().toArray(n -> new String[n])));
     }
 
     public Map<String, Object> getDocument(final FessEsClient fessEsClient, final String id, final String[] fields) {
         final FessConfig fessConfig = ComponentUtil.getFessConfig();
-        return fessEsClient.getDocument(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(), id, requestBuilder -> {
-            return true;
-        }).orElseGet(() -> null);
+        return fessEsClient.getDocument(fessConfig.getIndexDocumentSearchIndex(), fessConfig.getIndexDocumentType(), id,
+                requestBuilder -> {
+                    return true;
+                }).orElseGet(() -> null);
     }
 
     public List<Map<String, Object>> getDocumentListByPrefixId(final FessEsClient fessEsClient, final String id, final String[] fields) {
@@ -125,7 +126,7 @@ public class IndexingHelper {
 
     public void deleteChildDocument(final FessEsClient fessEsClient, final String id) {
         final FessConfig fessConfig = ComponentUtil.getFessConfig();
-        fessEsClient.deleteByQuery(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(),
+        fessEsClient.deleteByQuery(fessConfig.getIndexDocumentUpdateIndex(), fessConfig.getIndexDocumentType(),
                 QueryBuilders.termQuery(fessConfig.getIndexFieldParentId(), id));
     }
 
@@ -140,18 +141,19 @@ public class IndexingHelper {
         final FessConfig fessConfig = ComponentUtil.getFessConfig();
 
         final CountResponse countResponse =
-                fessEsClient.prepareCount(fessConfig.getIndexDocumentIndex()).setTypes(fessConfig.getIndexDocumentType())
+                fessEsClient.prepareCount(fessConfig.getIndexDocumentSearchIndex()).setTypes(fessConfig.getIndexDocumentType())
                         .setQuery(queryBuilder).execute().actionGet();
         final long numFound = countResponse.getCount();
         // TODO max threshold
 
-        return fessEsClient.getDocumentList(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(), requestBuilder -> {
-            requestBuilder.setQuery(queryBuilder).setSize((int) numFound);
-            if (fields != null) {
-                requestBuilder.addFields(fields);
-            }
-            return true;
-        });
+        return fessEsClient.getDocumentList(fessConfig.getIndexDocumentSearchIndex(), fessConfig.getIndexDocumentType(),
+                requestBuilder -> {
+                    requestBuilder.setQuery(queryBuilder).setSize((int) numFound);
+                    if (fields != null) {
+                        requestBuilder.addFields(fields);
+                    }
+                    return true;
+                });
 
     }
 }
diff --git a/src/main/java/org/codelibs/fess/helper/KeyMatchHelper.java b/src/main/java/org/codelibs/fess/helper/KeyMatchHelper.java
index 255e08354..b1a5c7186 100644
--- a/src/main/java/org/codelibs/fess/helper/KeyMatchHelper.java
+++ b/src/main/java/org/codelibs/fess/helper/KeyMatchHelper.java
@@ -90,7 +90,7 @@ public class KeyMatchHelper {
         final FessConfig fessConfig = ComponentUtil.getFessConfig();
         final List<Map<String, Object>> documentList =
                 fessEsClient.getDocumentList(
-                        fessConfig.getIndexDocumentIndex(),
+                        fessConfig.getIndexDocumentSearchIndex(),
                         fessConfig.getIndexDocumentType(),
                         searchRequestBuilder -> {
                             return SearchConditionBuilder.builder(searchRequestBuilder).administrativeAccess(true)
diff --git a/src/main/java/org/codelibs/fess/helper/SearchLogHelper.java b/src/main/java/org/codelibs/fess/helper/SearchLogHelper.java
index b1eaa19ec..83dfe22bd 100644
--- a/src/main/java/org/codelibs/fess/helper/SearchLogHelper.java
+++ b/src/main/java/org/codelibs/fess/helper/SearchLogHelper.java
@@ -244,22 +244,20 @@ public class SearchLogHelper {
                 searchService.bulkUpdate(builder -> {
                     final FessConfig fessConfig = ComponentUtil.getFessConfig();
                     searchService.getDocumentListByDocIds(clickCountMap.keySet().toArray(new String[clickCountMap.size()]),
-                            new String[] { fessConfig.getIndexFieldDocId() })
-                            .forEach(
-                                    doc -> {
-                                        final String id = DocumentUtil.getValue(doc, fessConfig.getIndexFieldDocId(), String.class);
-                                        final String docId = DocumentUtil.getValue(doc, fessConfig.getIndexFieldDocId(), String.class);
-                                        if (id != null && docId != null && clickCountMap.containsKey(docId)) {
-                                            final Integer count = clickCountMap.get(docId);
-                                            final Script script =
-                                                    new Script("ctx._source." + fessConfig.getIndexFieldClickCount() + "+="
-                                                            + count.toString());
-                                            final Map<String, Object> upsertMap = new HashMap<>();
-                                            upsertMap.put(fessConfig.getIndexFieldClickCount(), 1);
-                                            builder.add(new UpdateRequest(fessConfig.getIndexDocumentIndex(), fessConfig
-                                                    .getIndexDocumentType(), id).script(script).upsert(upsertMap));
-                                        }
-                                    });
+                            new String[] { fessConfig.getIndexFieldDocId() }).forEach(
+                            doc -> {
+                                final String id = DocumentUtil.getValue(doc, fessConfig.getIndexFieldDocId(), String.class);
+                                final String docId = DocumentUtil.getValue(doc, fessConfig.getIndexFieldDocId(), String.class);
+                                if (id != null && docId != null && clickCountMap.containsKey(docId)) {
+                                    final Integer count = clickCountMap.get(docId);
+                                    final Script script =
+                                            new Script("ctx._source." + fessConfig.getIndexFieldClickCount() + "+=" + count.toString());
+                                    final Map<String, Object> upsertMap = new HashMap<>();
+                                    upsertMap.put(fessConfig.getIndexFieldClickCount(), 1);
+                                    builder.add(new UpdateRequest(fessConfig.getIndexDocumentUpdateIndex(), fessConfig
+                                            .getIndexDocumentType(), id).script(script).upsert(upsertMap));
+                                }
+                            });
                 });
             } catch (final Exception e) {
                 logger.warn("Failed to update clickCounts", e);
diff --git a/src/main/java/org/codelibs/fess/helper/SuggestHelper.java b/src/main/java/org/codelibs/fess/helper/SuggestHelper.java
index 8236ff4ad..9261341cd 100644
--- a/src/main/java/org/codelibs/fess/helper/SuggestHelper.java
+++ b/src/main/java/org/codelibs/fess/helper/SuggestHelper.java
@@ -83,7 +83,7 @@ public class SuggestHelper {
         final Thread th = new Thread(() -> {
             final FessConfig fessConfig = ComponentUtil.getFessConfig();
             fessEsClient.admin().cluster().prepareHealth().setWaitForYellowStatus().execute().actionGet();
-            suggester = Suggester.builder().build(fessEsClient, fessConfig.getIndexDocumentIndex());
+            suggester = Suggester.builder().build(fessEsClient, fessConfig.getIndexDocumentSearchIndex());
             suggester.settings().array().delete(SuggestSettings.DefaultKeys.SUPPORTED_FIELDS);
             for (final String field : contentsIndexFieldNames) {
                 suggester.settings().array().add(SuggestSettings.DefaultKeys.SUPPORTED_FIELDS, field);
@@ -142,7 +142,7 @@ public class SuggestHelper {
 
         final FessConfig fessConfig = ComponentUtil.getFessConfig();
         final ESSourceReader reader =
-                new ESSourceReader(fessEsClient, suggester.settings(), fessConfig.getIndexDocumentIndex(),
+                new ESSourceReader(fessEsClient, suggester.settings(), fessConfig.getIndexDocumentSearchIndex(),
                         fessConfig.getIndexDocumentType());
         reader.setScrollSize(sourceReaderScrollSize);
         suggester.indexer().indexFromDocument(reader, 2, updateRequestIntervalMills).then(response -> {
diff --git a/src/main/java/org/codelibs/fess/job/PurgeDocJob.java b/src/main/java/org/codelibs/fess/job/PurgeDocJob.java
index e9735734f..ef10b3936 100644
--- a/src/main/java/org/codelibs/fess/job/PurgeDocJob.java
+++ b/src/main/java/org/codelibs/fess/job/PurgeDocJob.java
@@ -38,7 +38,7 @@ public class PurgeDocJob {
         // clean up
         final QueryBuilder queryBuilder = QueryBuilders.rangeQuery(fessConfig.getIndexFieldExpires()).to(new Date());
         try {
-            fessEsClient.deleteByQuery(fessConfig.getIndexDocumentIndex(), fessConfig.getIndexDocumentType(), queryBuilder);
+            fessEsClient.deleteByQuery(fessConfig.getIndexDocumentUpdateIndex(), fessConfig.getIndexDocumentType(), queryBuilder);
 
         } catch (final Exception e) {
             logger.error("Could not delete expired documents: " + queryBuilder.toString(), e);
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 8ff958199..e58916a1a 100644
--- a/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java
+++ b/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java
@@ -125,7 +125,10 @@ public interface FessConfig extends FessEnv {
     String INDEX_FIELD_FILETYPE = "index.field.filetype";
 
     /** The key of the configuration. e.g. fess */
-    String INDEX_DOCUMENT_INDEX = "index.document.index";
+    String INDEX_DOCUMENT_SEARCH_INDEX = "index.document.search.index";
+
+    /** The key of the configuration. e.g. fess */
+    String INDEX_DOCUMENT_UPDATE_INDEX = "index.document.update.index";
 
     /** The key of the configuration. e.g. doc */
     String INDEX_DOCUMENT_TYPE = "index.document.type";
@@ -570,12 +573,19 @@ public interface FessConfig extends FessEnv {
     String getIndexFieldFiletype();
 
     /**
-     * Get the value for the key 'index.document.index'. <br>
+     * Get the value for the key 'index.document.search.index'. <br>
      * The value is, e.g. fess <br>
      * comment: document index
      * @return The value of found property. (NotNull: if not found, exception but basically no way)
      */
-    String getIndexDocumentIndex();
+    String getIndexDocumentSearchIndex();
+
+    /**
+     * Get the value for the key 'index.document.update.index'. <br>
+     * The value is, e.g. fess <br>
+     * @return The value of found property. (NotNull: if not found, exception but basically no way)
+     */
+    String getIndexDocumentUpdateIndex();
 
     /**
      * Get the value for the key 'index.document.type'. <br>
@@ -1322,8 +1332,12 @@ public interface FessConfig extends FessEnv {
             return get(FessConfig.INDEX_FIELD_FILETYPE);
         }
 
-        public String getIndexDocumentIndex() {
-            return get(FessConfig.INDEX_DOCUMENT_INDEX);
+        public String getIndexDocumentSearchIndex() {
+            return get(FessConfig.INDEX_DOCUMENT_SEARCH_INDEX);
+        }
+
+        public String getIndexDocumentUpdateIndex() {
+            return get(FessConfig.INDEX_DOCUMENT_UPDATE_INDEX);
         }
 
         public String getIndexDocumentType() {
diff --git a/src/main/resources/fess_config.properties b/src/main/resources/fess_config.properties
index b00c9bbbb..fd1b31dbe 100644
--- a/src/main/resources/fess_config.properties
+++ b/src/main/resources/fess_config.properties
@@ -53,7 +53,8 @@ index.field.content_length=content_length
 index.field.filetype=filetype
 
 # document index
-index.document.index=fess
+index.document.search.index=fess
+index.document.update.index=fess
 index.document.type=doc
 
 # query