diff --git a/docker/thirdparties/docker-compose/elasticsearch/scripts/data/test_flatten_data.json b/docker/thirdparties/docker-compose/elasticsearch/scripts/data/test_flatten_data.json
new file mode 100644
index 00000000000000..d06811006281b2
--- /dev/null
+++ b/docker/thirdparties/docker-compose/elasticsearch/scripts/data/test_flatten_data.json
@@ -0,0 +1,26 @@
+{
+  "chatFiles": null,
+  "knowledgeFiles": null,
+  "extra": {
+    "action": "中文",
+    "action_id": "123",
+    "start_time": "2025/10/30 10:35:25",
+    "ua": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/5",
+    "mip": "12345",
+    "design_id": "67890",
+    "design_type": "A4",
+    "consume_time": 24,
+    "inputs": {
+      "prompt": "",
+      "image_url": "https://iamge/20251030022847441114matting-img_00001_.png",
+      "batch_size": 3
+    },
+    "outputs": [
+      {"text": "text1"},
+      {"text": "text2"},
+      {"text": "text3"}
+    ]
+  },
+  "docId": "b71db1f7",
+  "recordType": "R1"
+}
diff --git a/docker/thirdparties/docker-compose/elasticsearch/scripts/es_init.sh b/docker/thirdparties/docker-compose/elasticsearch/scripts/es_init.sh
index 7344dc09a27be4..d45e4b5fb4a7b4 100755
--- a/docker/thirdparties/docker-compose/elasticsearch/scripts/es_init.sh
+++ b/docker/thirdparties/docker-compose/elasticsearch/scripts/es_init.sh
@@ -132,6 +132,12 @@ curl "http://${ES_7_HOST}:9200/test2_20220809" -H "Content-Type:application/json
 curl "http://${ES_7_HOST}:9200/test3_20231005" -H "Content-Type:application/json" -X PUT -d '@/mnt/scripts/index/es7_test3.json'
 # create index test_object for object type testing (empty table)
 curl "http://${ES_7_HOST}:9200/test_object" -H "Content-Type:application/json" -X PUT -d '@/mnt/scripts/index/es7_test_object.json'
+
+# create index test_flatten to test flatten type
+curl "http://${ES_7_HOST}:9200/test_flatten" -H "Content-Type:application/json" -X PUT -d '@/mnt/scripts/index/es7_test_flatten.json'
+# put data for test_flatten
+curl "http://${ES_7_HOST}:9200/test_flatten/_doc/1" -H "Content-Type:application/json" -X POST -d '@/mnt/scripts/data/test_flatten_data.json'
+
 # put data for tese1
 curl "http://${ES_7_HOST}:9200/test1/_doc/1" -H "Content-Type:application/json" -X POST -d '@/mnt/scripts/data/data1.json'
 curl "http://${ES_7_HOST}:9200/test1/_doc/2" -H "Content-Type:application/json" -X POST -d '@/mnt/scripts/data/data2.json'
diff --git a/docker/thirdparties/docker-compose/elasticsearch/scripts/index/es7_test_flatten.json b/docker/thirdparties/docker-compose/elasticsearch/scripts/index/es7_test_flatten.json
new file mode 100644
index 00000000000000..d24c040aad1bf9
--- /dev/null
+++ b/docker/thirdparties/docker-compose/elasticsearch/scripts/index/es7_test_flatten.json
@@ -0,0 +1,25 @@
+{
+  "settings": {
+    "number_of_shards": 1,
+    "number_of_replicas": 0
+  },
+  "mappings": {
+    "properties": {
+      "chatFiles": {
+        "type": "keyword"
+      },
+      "knowledgeFiles": {
+        "type": "keyword"
+      },
+      "extra": {
+        "type": "flattened"
+      },
+      "docId": {
+        "type": "keyword"
+      },
+      "recordType": {
+        "type": "keyword"
+      }
+    }
+  }
+}
diff --git a/fe/fe-core/src/main/java/org/apache/doris/datasource/es/EsUtil.java b/fe/fe-core/src/main/java/org/apache/doris/datasource/es/EsUtil.java
index a350f386ada9cb..f1e907bfab9095 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/datasource/es/EsUtil.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/datasource/es/EsUtil.java
@@ -303,6 +303,7 @@ private static Column parseEsField(String fieldName, ObjectNode fieldValue, List
                 // When ES table is empty, object fields still have explicit "type": "object" in mapping
                 case "object":
                 case "nested":
+                case "flattened":
                     type = Type.JSONB;
                     break;
                 default:
diff --git a/regression-test/data/external_table_p0/es/test_es_flatten_type.out b/regression-test/data/external_table_p0/es/test_es_flatten_type.out
new file mode 100644
index 00000000000000..8f2ac5d2a31fc7
--- /dev/null
+++ b/regression-test/data/external_table_p0/es/test_es_flatten_type.out
@@ -0,0 +1,13 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !sql1 --
+\N	b71db1f7	{"outputs":[{"text":"text1"},{"text":"text2"},{"text":"text3"}],"start_time":"2025/10/30 10:35:25","consume_time":24,"action_id":"123","mip":"12345","design_id":"67890","inputs":{"batch_size":3,"image_url":"https://iamge/20251030022847441114matting-img_00001_.png","prompt":""},"action":"中文","design_type":"A4","ua":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/5"}	\N	R1
+
+-- !sql2 --
+\N	b71db1f7	["","123","12345","2025/10/30 10:35:25","24","3","67890","A4","Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/5","https://iamge/20251030022847441114matting-img_00001_.png","text1","text2","text3","中文"]	\N	R1
+
+-- !sql3 --
+{"outputs":[{"text":"text1"},{"text":"text2"},{"text":"text3"}],"start_time":"2025/10/30 10:35:25","consume_time":24,"action_id":"123","mip":"12345","design_id":"67890","inputs":{"batch_size":3,"image_url":"https://iamge/20251030022847441114matting-img_00001_.png","prompt":""},"action":"中文","design_type":"A4","ua":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/5"}
+
+-- !sql4 --
+["","123","12345","2025/10/30 10:35:25","24","3","67890","A4","Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/5","https://iamge/20251030022847441114matting-img_00001_.png","text1","text2","text3","中文"]
+
diff --git a/regression-test/suites/external_table_p0/es/test_es_flatten_type.groovy b/regression-test/suites/external_table_p0/es/test_es_flatten_type.groovy
new file mode 100644
index 00000000000000..7428dd386bcca1
--- /dev/null
+++ b/regression-test/suites/external_table_p0/es/test_es_flatten_type.groovy
@@ -0,0 +1,50 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+suite("test_es_flatten_type", "p0,external,es,external_docker,external_docker_es") {
+    String enabled = context.config.otherConfigs.get("enableEsTest")
+    if (enabled != null && enabled.equalsIgnoreCase("true")) {
+        String externalEnvIp = context.config.otherConfigs.get("externalEnvIp")
+        String es_7_port = context.config.otherConfigs.get("es_7_port")
+
+        sql """drop catalog if exists test_es7_flatten_type;"""
+
+        sql """create catalog test_es_query_es7_false properties(
+            "type"="es",
+            "hosts"="http://${externalEnvIp}:$es_7_port",
+            "nodes_discovery"="false",
+            "enable_keyword_sniff"="true",
+            "enable_docvalue_scan" = "false"
+        );
+        """
+
+        sql """create catalog test_es_query_es7_true properties(
+            "type"="es",
+            "hosts"="http://${externalEnvIp}:$es_7_port",
+            "nodes_discovery"="false",
+            "enable_keyword_sniff"="true",
+            "enable_docvalue_scan" = "true"
+        );
+        """
+
+        order_qt_sql1 "select * from test_es_query_es7_false.default_db.test_flatten";
+        order_qt_sql2 "select * from test_es_query_es7_true.default_db.test_flatten";
+        order_qt_sql3 "select extra from test_es_query_es7_false.default_db.test_flatten";
+        order_qt_sql4 "select extra from test_es_query_es7_true.default_db.test_flatten";
+
+    }
+}