Upgrade bleve from v2.0.6 to v2.3.0 (#18132)

vendor/github.com/blevesearch/bleve_index_api/directory.go

@@ -0,0 +1,23 @@
+//  Copyright (c) 2021 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.
+
+package index
+
+import (
+	"io"
+)
+
+type Directory interface {
+	GetWriter(filePath string) (io.WriteCloser, error)
+}