[MM-20979] Add first implementation of the Bleve search engine (#14562)

* [MM-20979] Add first implementation of the Bleve search engine

* Fix i18n

* Migrate searchengine utils tests

* Fix linter

* Don't add allTermsQ if both termQueries and notTermQueries are empty

* Fix test that should work if user is system admin

* Modify naming according to review comments

* Abstract getIndexDir function

* Extracting bleve engine name as a constant

* Merge both Indexer interfaces into one

* Add worker stopped message

* Allow worker to be started/stopped with config change

* Use constants for index names

* Modify test order

* Fix linter

* Trying to unlock the CI

vendor/github.com/blevesearch/bleve/doc.go

@@ -0,0 +1,38 @@
+//  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.
+
+/*
+Package bleve is a library for indexing and searching text.
+
+Example Opening New Index, Indexing Data
+
+    message := struct{
+        Id:   "example"
+        From: "marty.schoch@gmail.com",
+        Body: "bleve indexing is easy",
+    }
+
+    mapping := bleve.NewIndexMapping()
+    index, _ := bleve.New("example.bleve", mapping)
+    index.Index(message.Id, message)
+
+Example Opening Existing Index, Searching Data
+
+    index, _ := bleve.Open("example.bleve")
+    query := bleve.NewQueryStringQuery("bleve")
+    searchRequest := bleve.NewSearchRequest(query)
+    searchResult, _ := index.Search(searchRequest)
+
+*/
+package bleve