diff --git a/src/main/java/org/codelibs/fess/app/web/admin/upgrade/AdminUpgradeAction.java b/src/main/java/org/codelibs/fess/app/web/admin/upgrade/AdminUpgradeAction.java
index 0fc6dc1bb..9178c17ff 100644
--- a/src/main/java/org/codelibs/fess/app/web/admin/upgrade/AdminUpgradeAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/admin/upgrade/AdminUpgradeAction.java
@@ -23,6 +23,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.function.Consumer;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
@@ -79,6 +80,8 @@ public class AdminUpgradeAction extends FessAdminAction {
     //
     private static final Logger logger = LoggerFactory.getLogger(AdminUpgradeAction.class);
 
+    private static final String VERSION_10_2 = "10.2";
+
     private static final String VERSION_10_1 = "10.1";
 
     private static final String VERSION_10_0 = "10.0";
@@ -158,9 +161,23 @@ public class AdminUpgradeAction extends FessAdminAction {
         });
         verifyToken(() -> asIndexHtml());
 
-        if (VERSION_10_1.equals(form.targetVersion)) {
+        if (VERSION_10_2.equals(form.targetVersion)) {
+            try {
+                upgradeFrom10_2();
+                upgradeFromAll();
+
+                saveInfo(messages -> messages.addSuccessUpgradeFrom(GLOBAL));
+
+                fessEsClient.refresh();
+            } catch (final Exception e) {
+                logger.warn("Failed to upgrade data.", e);
+                saveError(messages -> messages.addErrorsFailedToUpgradeFrom(GLOBAL, VERSION_10_1, e.getLocalizedMessage()));
+            }
+        } else if (VERSION_10_1.equals(form.targetVersion)) {
             try {
                 upgradeFrom10_1();
+                upgradeFrom10_2();
+                upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessUpgradeFrom(GLOBAL));
 
@@ -173,6 +190,8 @@ public class AdminUpgradeAction extends FessAdminAction {
             try {
                 upgradeFrom10_0();
                 upgradeFrom10_1();
+                upgradeFrom10_2();
+                upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessUpgradeFrom(GLOBAL));
 
@@ -187,6 +206,20 @@ public class AdminUpgradeAction extends FessAdminAction {
         return redirect(getClass());
     }
 
+    private void upgradeFromAll() {
+        final IndicesAdminClient indicesClient = fessEsClient.admin().indices();
+        final String crawlerIndex = fessConfig.getIndexDocumentCrawlerIndex();
+
+        // .crawler
+        if (existsIndex(indicesClient, crawlerIndex, IndicesOptions.fromOptions(false, true, true, true))) {
+            deleteIndex(indicesClient, crawlerIndex, response -> {});
+        }
+    }
+
+    private void upgradeFrom10_2() {
+        // TODO 
+    }
+
     private void upgradeFrom10_1() {
         final IndicesAdminClient indicesClient = fessEsClient.admin().indices();
         final String indexConfigPath = "fess_indices";
@@ -196,6 +229,7 @@ public class AdminUpgradeAction extends FessAdminAction {
         final String searchIndex = fessConfig.getIndexDocumentSearchIndex();
         final String oldDocIndex = "fess";
         final String suggestAnalyzerIndex = ".suggest.analyzer";
+        final String suggestIndex = fessConfig.getIndexDocumentSuggestIndex();
 
         // file
         uploadResource(indexConfigPath, oldDocIndex, "ja/mapping.txt");
@@ -701,31 +735,21 @@ public class AdminUpgradeAction extends FessAdminAction {
         }
 
         // fess.suggest
-        final String suggestIndex = fessConfig.getIndexDocumentSuggestIndex();
         if (existsIndex(indicesClient, suggestIndex, IndicesOptions.fromOptions(false, true, true, true))) {
-            indicesClient.prepareDelete(suggestIndex).execute(new ActionListener<DeleteIndexResponse>() {
-
-                @Override
-                public void onResponse(DeleteIndexResponse response) {
-                    scheduledJobService.getScheduledJob("suggest_indexer").ifPresent(entity -> {
-                        if (!entity.isEnabled() || entity.isRunning()) {
-                            logger.warn("suggest_indexer job is running.");
-                            return;
-                        }
-                        try {
-                            entity.start();
-                        } catch (final Exception e) {
-                            logger.warn("Failed to start suggest_indexer job.", e);
-                        }
-                    }).orElse(() -> {
-                        logger.warn("No suggest_indexer job.");
-                    });
-                }
-
-                @Override
-                public void onFailure(Throwable e) {
-                    logger.warn("Failed to delete " + suggestIndex + " index.", e);
-                }
+            deleteIndex(indicesClient, suggestIndex, response -> {
+                scheduledJobService.getScheduledJob("suggest_indexer").ifPresent(entity -> {
+                    if (!entity.isEnabled() || entity.isRunning()) {
+                        logger.warn("suggest_indexer job is running.");
+                        return;
+                    }
+                    try {
+                        entity.start();
+                    } catch (final Exception e) {
+                        logger.warn("Failed to start suggest_indexer job.", e);
+                    }
+                }).orElse(() -> {
+                    logger.warn("No suggest_indexer job.");
+                });
             });
         }
     }
@@ -1049,4 +1073,20 @@ public class AdminUpgradeAction extends FessAdminAction {
         return false;
     }
 
+    private void deleteIndex(final IndicesAdminClient indicesClient, final String index, final Consumer<DeleteIndexResponse> comsumer) {
+        indicesClient.prepareDelete(index).execute(new ActionListener<DeleteIndexResponse>() {
+
+            @Override
+            public void onResponse(DeleteIndexResponse response) {
+                logger.info("Deleted " + index + " index.");
+                comsumer.accept(response);
+            }
+
+            @Override
+            public void onFailure(Throwable e) {
+                logger.warn("Failed to delete " + index + " index.", e);
+            }
+        });
+    }
+
 }
\ No newline at end of file
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 ad29b4606..1de838390 100644
--- a/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java
+++ b/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java
@@ -363,6 +363,9 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
     /** The key of the configuration. e.g. fess */
     String INDEX_DOCUMENT_SUGGEST_INDEX = "index.document.suggest.index";
 
+    /** The key of the configuration. e.g. .crawler */
+    String INDEX_DOCUMENT_CRAWLER_INDEX = "index.document.crawler.index";
+
     /** The key of the configuration. e.g. lang,role,label,anchor */
     String INDEX_ADMIN_ARRAY_FIELDS = "index.admin.array.fields";
 
@@ -2046,6 +2049,13 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
      */
     String getIndexDocumentSuggestIndex();
 
+    /**
+     * Get the value for the key 'index.document.crawler.index'. <br>
+     * The value is, e.g. .crawler <br>
+     * @return The value of found property. (NotNull: if not found, exception but basically no way)
+     */
+    String getIndexDocumentCrawlerIndex();
+
     /**
      * Get the value for the key 'index.admin.array.fields'. <br>
      * The value is, e.g. lang,role,label,anchor <br>
@@ -4690,6 +4700,10 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
             return get(FessConfig.INDEX_DOCUMENT_SUGGEST_INDEX);
         }
 
+        public String getIndexDocumentCrawlerIndex() {
+            return get(FessConfig.INDEX_DOCUMENT_CRAWLER_INDEX);
+        }
+
         public String getIndexAdminArrayFields() {
             return get(FessConfig.INDEX_ADMIN_ARRAY_FIELDS);
         }
diff --git a/src/main/resources/fess_config.properties b/src/main/resources/fess_config.properties
index 88a9d1fa5..cdcd4bc07 100644
--- a/src/main/resources/fess_config.properties
+++ b/src/main/resources/fess_config.properties
@@ -173,6 +173,7 @@ index.document.search.index=fess.search
 index.document.update.index=fess.update
 index.document.type=doc
 index.document.suggest.index=fess
+index.document.crawler.index=.crawler
 
 # doc management
 index.admin.array.fields=lang,role,label,anchor