diff --git a/src/main/resources/fess_indices/_aws/fess/doc.json b/src/main/resources/fess_indices/_aws/fess/doc.json
index 9e49f15f8..32d9bee3c 100644
--- a/src/main/resources/fess_indices/_aws/fess/doc.json
+++ b/src/main/resources/fess_indices/_aws/fess/doc.json
@@ -118,7 +118,7 @@
         }
       },
       {
-        "lang_et": {
+        "lang_eu": {
           "match": "*_eu",
           "mapping": {
             "type": "text",
diff --git a/src/main/resources/fess_indices/_cloud/fess/doc.json b/src/main/resources/fess_indices/_cloud/fess/doc.json
index 9e49f15f8..32d9bee3c 100644
--- a/src/main/resources/fess_indices/_cloud/fess/doc.json
+++ b/src/main/resources/fess_indices/_cloud/fess/doc.json
@@ -118,7 +118,7 @@
         }
       },
       {
-        "lang_et": {
+        "lang_eu": {
           "match": "*_eu",
           "mapping": {
             "type": "text",
diff --git a/src/main/resources/fess_indices/fess/doc.json b/src/main/resources/fess_indices/fess/doc.json
index 5b8e3fa94..987dd2aa8 100644
--- a/src/main/resources/fess_indices/fess/doc.json
+++ b/src/main/resources/fess_indices/fess/doc.json
@@ -118,7 +118,7 @@
         }
       },
       {
-        "lang_et": {
+        "lang_eu": {
           "match": "*_eu",
           "mapping": {
             "type": "text",