Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

config_disk.go

@@ -0,0 +1,26 @@
+//  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.
+
+//go:build !appengine && !appenginevm
+// +build !appengine,!appenginevm
+
+package bleve
+
+import "github.com/blevesearch/bleve/v2/index/upsidedown/store/boltdb"
+
+// in normal environments we configure boltdb as the default storage
+func initDisk() {
+	// default kv store
+	Config.DefaultKVStore = boltdb.Name
+}