[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

model/client4.go

@@ -353,6 +353,10 @@ func (c *Client4) GetElasticsearchRoute() string {
 	return "/elasticsearch"
 }
 
+func (c *Client4) GetBleveRoute() string {
+	return fmt.Sprintf("/bleve")
+}
+
 func (c *Client4) GetCommandsRoute() string {
 	return "/commands"
 }
@@ -4075,6 +4079,18 @@ func (c *Client4) PurgeElasticsearchIndexes() (bool, *Response) {
 	return CheckStatusOK(r), BuildResponse(r)
 }
 
+// Bleve Section
+
+// PurgeBleveIndexes immediately deletes all Bleve indexes.
+func (c *Client4) PurgeBleveIndexes() (bool, *Response) {
+	r, err := c.DoApiPost(c.GetBleveRoute()+"/purge_indexes", "")
+	if err != nil {
+		return false, BuildErrorResponse(r, err)
+	}
+	defer closeBody(r)
+	return CheckStatusOK(r), BuildResponse(r)
+}
+
 // Data Retention Section
 
 // GetDataRetentionPolicy will get the current server data retention policy details.