diff --git a/src/main/resources/fess_indices/fess.json b/src/main/resources/fess_indices/fess.json
index b77e390a1..f04d01e34 100644
--- a/src/main/resources/fess_indices/fess.json
+++ b/src/main/resources/fess_indices/fess.json
@@ -681,8 +681,7 @@
           "n": "1",
           "synonyms_path": "${fess.dictionary.path}synonym.txt",
           "dynamic_reload": true,
-          "expand": false,
-          "expand_ngram": true,
+          "expand": true,
           "reload_interval": "1m"
         },
         "unigram_search_tokenizer": {
@@ -691,7 +690,6 @@
           "synonyms_path": "${fess.dictionary.path}synonym.txt",
           "dynamic_reload": true,
           "expand": false,
-          "expand_ngram": false,
           "reload_interval": "1m"
         },
         "bigram_tokenizer": {