diff --git a/go.mod b/go.mod
index d404b9d52..98ac2b4e5 100644
--- a/go.mod
+++ b/go.mod
@@ -27,7 +27,6 @@ require (
 	github.com/go-sql-driver/mysql v1.5.0
 	github.com/gocql/gocql v0.0.0-20190829130954-e163eff7a8c6
 	github.com/gogo/protobuf v1.2.2-0.20190730201129-28a6bbf47e48 // indirect
-	github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6 // indirect
 	github.com/golang/protobuf v1.4.2
 	github.com/google/btree v1.0.0
 	github.com/google/uuid v1.1.1
diff --git a/weed/command/scaffold.go b/weed/command/scaffold.go
index 479e0665f..68fe8e982 100644
--- a/weed/command/scaffold.go
+++ b/weed/command/scaffold.go
@@ -177,7 +177,7 @@ database = "seaweedfs"
 [elastic7]
 enabled = false
 servers = "http://localhost:9200"
-# increase the value is recommend, both here and in elastic cluster configuration
+# increase the value is recommend, be sure the value in Elastic is greater or equal here
 index.max_result_window = 10000
 `
 
diff --git a/weed/filer/elastic/v7/elastic_store.go b/weed/filer/elastic/v7/elastic_store.go
index 5c57e352a..29e9689f4 100644
--- a/weed/filer/elastic/v7/elastic_store.go
+++ b/weed/filer/elastic/v7/elastic_store.go
@@ -16,8 +16,14 @@ import (
 )
 
 var (
-	indexType   = "_doc"
-	indexPrefix = ".seaweedfs_"
+	indexType           = "_doc"
+	indexPrefix         = ".seaweedfs_"
+	indexKV             = ".seaweedfs_kv_entries"
+	mappingWithoutQuery = ` {
+  "mappings": {
+	"enabled": false
+  }
+}`
 )
 
 type ESEntry struct {
@@ -25,6 +31,10 @@ type ESEntry struct {
 	Entry    *filer.Entry
 }
 
+type ESKVEntry struct {
+	Value string `json:Value`
+}
+
 func init() {
 	filer.Stores = append(filer.Stores, &ElasticStore{})
 }
@@ -55,6 +65,12 @@ func (store *ElasticStore) Initialize(configuration weed_util.Configuration, pre
 	if err != nil {
 		return fmt.Errorf("init elastic %s: %v.", servers, err)
 	}
+	if ok, err := store.client.IndexExists(indexKV).Do(context.Background()); err == nil && !ok {
+		_, err = store.client.CreateIndex(indexKV).Body(mappingWithoutQuery).Do(context.Background())
+		if err != nil {
+			return fmt.Errorf("create index(%s) %v.", indexKV, err)
+		}
+	}
 	return nil
 }
 func (store *ElasticStore) BeginTransaction(ctx context.Context) (context.Context, error) {
@@ -66,15 +82,6 @@ func (store *ElasticStore) CommitTransaction(ctx context.Context) error {
 func (store *ElasticStore) RollbackTransaction(ctx context.Context) error {
 	return nil
 }
-func (store *ElasticStore) KvDelete(ctx context.Context, key []byte) (err error) {
-	return filer.ErrKvNotImplemented
-}
-func (store *ElasticStore) KvGet(ctx context.Context, key []byte) (value []byte, err error) {
-	return []byte(""), filer.ErrKvNotImplemented
-}
-func (store *ElasticStore) KvPut(ctx context.Context, key []byte, value []byte) (err error) {
-	return filer.ErrKvNotImplemented
-}
 func (store *ElasticStore) ListDirectoryPrefixedEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer.Entry, err error) {
 	return nil, filer.ErrUnsupportedListDirectoryPrefixed
 }
@@ -97,7 +104,7 @@ func (store *ElasticStore) InsertEntry(ctx context.Context, entry *filer.Entry)
 		Type(indexType).
 		Id(id).
 		BodyJson(string(value)).
-		Do(context.Background())
+		Do(ctx)
 	if err != nil {
 		glog.Errorf("insert entry(%s) %v.", string(entry.FullPath), err)
 		return fmt.Errorf("insert entry %v.", err)
@@ -114,7 +121,7 @@ func (store *ElasticStore) FindEntry(ctx context.Context, fullpath weed_util.Ful
 		Index(index).
 		Type(indexType).
 		Id(id).
-		Do(context.Background())
+		Do(ctx)
 	if elastic.IsNotFound(err) {
 		return nil, filer_pb.ErrNotFound
 	}
@@ -133,24 +140,24 @@ func (store *ElasticStore) DeleteEntry(ctx context.Context, fullpath weed_util.F
 	index := getIndex(fullpath)
 	id := fmt.Sprintf("%x", md5.Sum([]byte(fullpath)))
 	if strings.Count(string(fullpath), "/") == 1 {
-		return store.deleteIndex(index)
+		return store.deleteIndex(ctx, index)
 	}
-	return store.deleteEntry(index, id)
+	return store.deleteEntry(ctx, index, id)
 }
-func (store *ElasticStore) deleteIndex(index string) (err error) {
-	deleteResult, err := store.client.DeleteIndex(index).Do(context.Background())
+func (store *ElasticStore) deleteIndex(ctx context.Context, index string) (err error) {
+	deleteResult, err := store.client.DeleteIndex(index).Do(ctx)
 	if elastic.IsNotFound(err) || (err == nil && deleteResult.Acknowledged) {
 		return nil
 	}
 	glog.Errorf("delete index(%s) %v.", index, err)
 	return err
 }
-func (store *ElasticStore) deleteEntry(index, id string) (err error) {
+func (store *ElasticStore) deleteEntry(ctx context.Context, index, id string) (err error) {
 	deleteResult, err := store.client.Delete().
 		Index(index).
 		Type(indexType).
 		Id(id).
-		Do(context.Background())
+		Do(ctx)
 	if err == nil {
 		if deleteResult.Result == "deleted" || deleteResult.Result == "not_found" {
 			return nil
@@ -178,12 +185,15 @@ func (store *ElasticStore) ListDirectoryEntries(
 }
 
 func (store *ElasticStore) listRootDirectoryEntries(ctx context.Context, startFileName string, inclusive bool, limit int) (entries []*filer.Entry, err error) {
-	indexResult, err := store.client.CatIndices().Do(context.Background())
+	indexResult, err := store.client.CatIndices().Do(ctx)
 	if err != nil {
 		glog.Errorf("list indices %v.", err)
 		return entries, err
 	}
 	for _, index := range indexResult {
+		if index.Index == indexKV {
+			continue
+		}
 		if strings.HasPrefix(index.Index, indexPrefix) {
 			if entry, err := store.FindEntry(ctx,
 				weed_util.FullPath("/"+strings.Replace(index.Index, indexPrefix, "", 1))); err == nil {
@@ -209,16 +219,16 @@ func (store *ElasticStore) listDirectoryEntries(
 	index := getIndex(fullpath)
 	nextStart := ""
 	parentId := fmt.Sprintf("%x", md5.Sum([]byte(fullpath)))
-	if _, err := store.client.Refresh(index).Do(context.Background()); err != nil {
+	if _, err := store.client.Refresh(index).Do(ctx); err != nil {
 		if elastic.IsNotFound(err) {
-			store.client.CreateIndex(index).Do(context.Background())
+			store.client.CreateIndex(index).Do(ctx)
 			return entries, nil
 		}
 	}
 	for {
 		result := &elastic.SearchResult{}
 		if (startFileName == "" && first) || inclusive {
-			if result, err = store.search(index, parentId); err != nil {
+			if result, err = store.search(ctx, index, parentId); err != nil {
 				glog.Errorf("search (%s,%s,%t,%d) %v.", string(fullpath), startFileName, inclusive, limit, err)
 				return entries, err
 			}
@@ -228,7 +238,7 @@ func (store *ElasticStore) listDirectoryEntries(
 				fullPath = nextStart
 			}
 			after := fmt.Sprintf("%x", md5.Sum([]byte(fullPath)))
-			if result, err = store.searchAfter(index, parentId, after); err != nil {
+			if result, err = store.searchAfter(ctx, index, parentId, after); err != nil {
 				glog.Errorf("searchAfter (%s,%s,%t,%d) %v.", string(fullpath), startFileName, inclusive, limit, err)
 				return entries, err
 			}
@@ -259,8 +269,8 @@ func (store *ElasticStore) listDirectoryEntries(
 	return entries, nil
 }
 
-func (store *ElasticStore) search(index, parentId string) (result *elastic.SearchResult, err error) {
-	if count, err := store.client.Count(index).Do(context.Background()); err == nil && count == 0 {
+func (store *ElasticStore) search(ctx context.Context, index, parentId string) (result *elastic.SearchResult, err error) {
+	if count, err := store.client.Count(index).Do(ctx); err == nil && count == 0 {
 		return &elastic.SearchResult{
 			Hits: &elastic.SearchHits{
 				Hits: make([]*elastic.SearchHit, 0)},
@@ -271,18 +281,18 @@ func (store *ElasticStore) search(index, parentId string) (result *elastic.Searc
 		Query(elastic.NewMatchQuery("ParentId", parentId)).
 		Size(store.maxPageSize).
 		Sort("_id", false).
-		Do(context.Background())
+		Do(ctx)
 	return queryResult, err
 }
 
-func (store *ElasticStore) searchAfter(index, parentId, after string) (result *elastic.SearchResult, err error) {
+func (store *ElasticStore) searchAfter(ctx context.Context, index, parentId, after string) (result *elastic.SearchResult, err error) {
 	queryResult, err := store.client.Search().
 		Index(index).
 		Query(elastic.NewMatchQuery("ParentId", parentId)).
 		SearchAfter(after).
 		Size(store.maxPageSize).
 		Sort("_id", false).
-		Do(context.Background())
+		Do(ctx)
 	return queryResult, err
 
 }
diff --git a/weed/filer/elastic/v7/elastic_store_kv.go b/weed/filer/elastic/v7/elastic_store_kv.go
new file mode 100644
index 000000000..cfb3fdf8c
--- /dev/null
+++ b/weed/filer/elastic/v7/elastic_store_kv.go
@@ -0,0 +1,64 @@
+package elastic
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	jsoniter "github.com/json-iterator/go"
+	elastic "github.com/olivere/elastic/v7"
+)
+
+func (store *ElasticStore) KvDelete(ctx context.Context, key []byte) (err error) {
+	deleteResult, err := store.client.Delete().
+		Index(indexKV).
+		Type(indexType).
+		Id(string(key)).
+		Do(ctx)
+	if err == nil {
+		if deleteResult.Result == "deleted" || deleteResult.Result == "not_found" {
+			return nil
+		}
+	}
+	glog.Errorf("delete key(id:%s) %v.", string(key), err)
+	return fmt.Errorf("delete key %v.", err)
+}
+
+func (store *ElasticStore) KvGet(ctx context.Context, key []byte) (value []byte, err error) {
+	searchResult, err := store.client.Get().
+		Index(indexKV).
+		Type(indexType).
+		Id(string(key)).
+		Do(ctx)
+	if elastic.IsNotFound(err) {
+		return nil, filer_pb.ErrNotFound
+	}
+	if searchResult != nil && searchResult.Found {
+		esEntry := &ESKVEntry{}
+		if err := jsoniter.Unmarshal(searchResult.Source, esEntry); err == nil {
+			return []byte(esEntry.Value), nil
+		}
+	}
+	glog.Errorf("find key(%s),%v.", string(key), err)
+	return nil, filer_pb.ErrNotFound
+}
+
+func (store *ElasticStore) KvPut(ctx context.Context, key []byte, value []byte) (err error) {
+	esEntry := &ESKVEntry{string(value)}
+	val, err := jsoniter.Marshal(esEntry)
+	if err != nil {
+		glog.Errorf("insert key(%s) %v.", string(key), err)
+		return fmt.Errorf("insert key %v.", err)
+	}
+	_, err = store.client.Index().
+		Index(indexKV).
+		Type(indexType).
+		Id(string(key)).
+		BodyJson(string(val)).
+		Do(ctx)
+	if err != nil {
+		return fmt.Errorf("kv put: %v", err)
+	}
+	return nil
+}