[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/job.go

@@ -15,6 +15,7 @@ const (
 	JOB_TYPE_MESSAGE_EXPORT                 = "message_export"
 	JOB_TYPE_ELASTICSEARCH_POST_INDEXING    = "elasticsearch_post_indexing"
 	JOB_TYPE_ELASTICSEARCH_POST_AGGREGATION = "elasticsearch_post_aggregation"
+	JOB_TYPE_BLEVE_POST_INDEXING            = "bleve_post_indexing"
 	JOB_TYPE_LDAP_SYNC                      = "ldap_sync"
 	JOB_TYPE_MIGRATIONS                     = "migrations"
 	JOB_TYPE_PLUGINS                        = "plugins"
@@ -53,6 +54,7 @@ func (j *Job) IsValid() *AppError {
 	case JOB_TYPE_DATA_RETENTION:
 	case JOB_TYPE_ELASTICSEARCH_POST_INDEXING:
 	case JOB_TYPE_ELASTICSEARCH_POST_AGGREGATION:
+	case JOB_TYPE_BLEVE_POST_INDEXING:
 	case JOB_TYPE_LDAP_SYNC:
 	case JOB_TYPE_MESSAGE_EXPORT:
 	case JOB_TYPE_MIGRATIONS: