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 e833e566b..bd4b2aaeb 100644
--- a/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java
+++ b/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java
@@ -297,9 +297,6 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
 
     /** The key of the configuration. e.g. title=title:string
     Title=title:string
-    Last-Save-Date=last_modified:date
-    Last-Modified=last_modified:date
-    ModDate=last_modified:pdf_date
     */
     String CRAWLER_METADATA_NAME_MAPPING = "crawler.metadata.name.mapping";
 
@@ -2183,9 +2180,6 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
      * Get the value for the key 'crawler.metadata.name.mapping'. <br>
      * The value is, e.g. title=title:string
     Title=title:string
-    Last-Save-Date=last_modified:date
-    Last-Modified=last_modified:date
-    ModDate=last_modified:pdf_date
     <br>
      * @return The value of found property. (NotNull: if not found, exception but basically no way)
      */
@@ -8301,9 +8295,7 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
             defaultMap.put(FessConfig.CRAWLER_FAILURE_URL_STATUS_CODES, "404");
             defaultMap.put(FessConfig.CRAWLER_SYSTEM_MONITOR_INTERVAL, "60");
             defaultMap.put(FessConfig.CRAWLER_METADATA_CONTENT_EXCLUDES, "resourceName,X-Parsed-By,Content-Encoding.*,Content-Type.*");
-            defaultMap
-                    .put(FessConfig.CRAWLER_METADATA_NAME_MAPPING,
-                            "title=title:string\nTitle=title:string\nLast-Save-Date=last_modified:date\nLast-Modified=last_modified:date\nModDate=last_modified:pdf_date\n");
+            defaultMap.put(FessConfig.CRAWLER_METADATA_NAME_MAPPING, "title=title:string\nTitle=title:string\n");
             defaultMap.put(FessConfig.CRAWLER_DOCUMENT_HTML_CONTENT_XPATH, "//BODY");
             defaultMap.put(FessConfig.CRAWLER_DOCUMENT_HTML_LANG_XPATH, "//HTML/@lang");
             defaultMap.put(FessConfig.CRAWLER_DOCUMENT_HTML_DIGEST_XPATH, "//META[@name='description']/@content");
diff --git a/src/main/resources/fess_config.properties b/src/main/resources/fess_config.properties
index b78896319..354ee33a1 100644
--- a/src/main/resources/fess_config.properties
+++ b/src/main/resources/fess_config.properties
@@ -184,9 +184,6 @@ crawler.metadata.content.excludes=resourceName,X-Parsed-By,Content-Encoding.*,Co
 crawler.metadata.name.mapping=\
 title=title:string\n\
 Title=title:string\n\
-Last-Save-Date=last_modified:date\n\
-Last-Modified=last_modified:date\n\
-ModDate=last_modified:pdf_date\n\
 
 # html
 crawler.document.html.content.xpath=//BODY