[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/go.mod

@@ -0,0 +1,25 @@
+module github.com/blevesearch/bleve
+
+go 1.13
+
+require (
+	github.com/RoaringBitmap/roaring v0.4.21
+	github.com/blevesearch/blevex v0.0.0-20190916190636-152f0fe5c040
+	github.com/blevesearch/go-porterstemmer v1.0.3
+	github.com/blevesearch/segment v0.9.0
+	github.com/blevesearch/snowballstem v0.9.0
+	github.com/blevesearch/zap/v11 v11.0.7
+	github.com/blevesearch/zap/v12 v12.0.7
+	github.com/couchbase/ghistogram v0.1.0 // indirect
+	github.com/couchbase/moss v0.1.0
+	github.com/couchbase/vellum v1.0.1
+	github.com/golang/protobuf v1.3.2
+	github.com/kljensen/snowball v0.6.0
+	github.com/rcrowley/go-metrics v0.0.0-20190826022208-cac0b30c2563
+	github.com/spf13/cobra v0.0.5
+	github.com/steveyen/gtreap v0.1.0
+	github.com/syndtr/goleveldb v1.0.0
+	github.com/willf/bitset v1.1.10
+	go.etcd.io/bbolt v1.3.4
+	golang.org/x/text v0.3.0
+)