diff --git a/weed/filer/elastic/v7/elastic_store.go b/weed/filer/elastic/v7/elastic_store.go
index f720fdea0..f1c35f7c6 100644
--- a/weed/filer/elastic/v7/elastic_store.go
+++ b/weed/filer/elastic/v7/elastic_store.go
@@ -20,10 +20,15 @@ var (
 	indexPrefix         = ".seaweedfs_"
 	indexKV             = ".seaweedfs_kv_entries"
 	mappingWithoutQuery = ` {
-  "mappings": {
-	"enabled": false
-  }
-}`
+		     "mappings": {
+		   	"enabled": false,
+		       "properties": {
+		         "Value":{
+		           "type": "binary"
+		         }
+		       }
+		     }
+		   }`
 )
 
 type ESEntry struct {
@@ -32,7 +37,7 @@ type ESEntry struct {
 }
 
 type ESKVEntry struct {
-	Value string `json:Value`
+	Value []byte `json:"Value"`
 }
 
 func init() {
diff --git a/weed/filer/elastic/v7/elastic_store_kv.go b/weed/filer/elastic/v7/elastic_store_kv.go
index 1b26bdf8e..99c03314e 100644
--- a/weed/filer/elastic/v7/elastic_store_kv.go
+++ b/weed/filer/elastic/v7/elastic_store_kv.go
@@ -3,6 +3,7 @@ package elastic
 import (
 	"context"
 	"fmt"
+
 	"github.com/chrislusf/seaweedfs/weed/filer"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -32,20 +33,20 @@ func (store *ElasticStore) KvGet(ctx context.Context, key []byte) (value []byte,
 		Id(string(key)).
 		Do(ctx)
 	if elastic.IsNotFound(err) {
-		return nil, filer.ErrKvNotFound
+		return value, filer.ErrKvNotFound
 	}
 	if searchResult != nil && searchResult.Found {
 		esEntry := &ESKVEntry{}
 		if err := jsoniter.Unmarshal(searchResult.Source, esEntry); err == nil {
-			return []byte(esEntry.Value), nil
+			return esEntry.Value, nil
 		}
 	}
 	glog.Errorf("find key(%s),%v.", string(key), err)
-	return nil, filer.ErrKvNotFound
+	return value, filer.ErrKvNotFound
 }
 
 func (store *ElasticStore) KvPut(ctx context.Context, key []byte, value []byte) (err error) {
-	esEntry := &ESKVEntry{string(value)}
+	esEntry := &ESKVEntry{value}
 	val, err := jsoniter.Marshal(esEntry)
 	if err != nil {
 		glog.Errorf("insert key(%s) %v.", string(key), err)