go mod and vendor/ update

vendor/github.com/blevesearch/bleve/registry/store.go

@@ -1,11 +1,16 @@
 //  Copyright (c) 2014 Couchbase, Inc.
-//  Licensed 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.
+//
+// Licensed 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.
 
 package registry
 
@@ -23,6 +28,12 @@ func RegisterKVStore(name string, constructor KVStoreConstructor) {
 	stores[name] = constructor
 }
 
+// KVStoreConstructor is used to build a KVStore of a specific type when
+// specificied by the index configuration. In addition to meeting the
+// store.KVStore interface, KVStores must also support this constructor.
+// Note that currently the values of config must
+// be able to be marshaled and unmarshaled using the encoding/json library (used
+// when reading/writing the index metadata file).
 type KVStoreConstructor func(mo store.MergeOperator, config map[string]interface{}) (store.KVStore, error)
 type KVStoreRegistry map[string]KVStoreConstructor
 
@@ -31,8 +42,8 @@ func KVStoreConstructorByName(name string) KVStoreConstructor {
 }
 
 func KVStoreTypesAndInstances() ([]string, []string) {
-	types := make([]string, 0)
-	instances := make([]string, 0)
+	var types []string
+	var instances []string
 	for name := range stores {
 		types = append(types, name)
 	}