Adding the new search engine abstraction (#13304)

* WIP

* Adding bleve to go modules

* WIP

* Adding missing files from searchengine implementation

* WIP

* WIP

* WIP

* WIP

* WIP

* WIP

* User and channel indexing and searches implemented

* Make bleve tests run with in-memory indexes

* Implement post index and deletion tests

* Initial commits for the search layer

* Removing unnecesary indexing

* WIP

* WIP

* More fixes for tests

* Adding the search layer

* Finishing the migration of searchers to the layer

* Removing unnecesary code

* Allowing multiple engines active at the same time

* WIP

* Add simple post search

* Print information when using bleve

* Adding some debugging to understand better how the searches are working

* Making more dynamic config of search engines

* Add post search basics

* Adding the Purge API endpoint

* Fixing bleve config updates

* Adding missed file

* Regenerating search engine mocks

* Adding missed v5 to modules imports

* fixing i18n

* Fixing some test around search engine

* Removing all bleve traces

* Cleaning up the vendors directory and go.mod/go.sum files

* Regenerating timer layer

* Adding properly the license

* Fixing govet shadow error

* Fixing some tests

* Fixing TestSearchPostsFromUser

* Fixing another test

* Fixing more tests

* Fixing more tests

* Removing SearchEngine redundant text from searchengine module code

* Fixing some reindexing problems in members updates

* Fixing tests

* Addressing PR comments

* Reverting go.mod and go.sum

* Addressing PR comments

* Fixing tests compilation

* Fixing govet

* Adding search engine stop method

* Being more explicit on where we use includeDeleted

* Adding GetSqlSupplier test helper method

* Mocking elasticsearch start function

* Fixing tests

Co-authored-by: Miguel de la Cruz <miguel@mcrx.me>
Co-authored-by: mattermod <mattermod@users.noreply.github.com>

app/layer_generators/opentracing_layer.go.tmpl

@@ -31,7 +31,7 @@ type {{.Name}} struct {
 	cluster          einterfaces.ClusterInterface
 	compliance       einterfaces.ComplianceInterface
 	dataRetention    einterfaces.DataRetentionInterface
-	elasticsearch    einterfaces.ElasticsearchInterface
+	searchEngine     *searchengine.Broker
 	ldap             einterfaces.LdapInterface
 	messageExport    einterfaces.MessageExportInterface
 	metrics          einterfaces.MetricsInterface
@@ -99,7 +99,7 @@ func NewOpenTracingAppLayer(childApp AppIface, ctx context.Context) *{{.Name}} {
 	newApp.cluster = childApp.Cluster()
 	newApp.compliance = childApp.Compliance()
 	newApp.dataRetention = childApp.DataRetention()
-	newApp.elasticsearch = childApp.Elasticsearch()
+	newApp.searchEngine = childApp.SearchEngine()
 	newApp.ldap = childApp.Ldap()
 	newApp.messageExport = childApp.MessageExport()
 	newApp.metrics = childApp.Metrics()
@@ -156,9 +156,6 @@ func (a *{{.Name}}) Compliance() einterfaces.ComplianceInterface {
 func (a *{{.Name}}) DataRetention() einterfaces.DataRetentionInterface {
 	return a.dataRetention
 }
-func (a *{{.Name}}) Elasticsearch() einterfaces.ElasticsearchInterface {
-	return a.elasticsearch
-}
 func (a *{{.Name}}) Ldap() einterfaces.LdapInterface {
 	return a.ldap
 }
@@ -215,4 +212,4 @@ func (a *{{.Name}}) SetServer(srv *Server) {
 }
 func (a *{{.Name}}) GetT() goi18n.TranslateFunc {
 	return a.t
-}
+}