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>

store/timer_layer.go

@@ -872,10 +872,10 @@ func (s *TimerLayerChannelStore) GetChannelsBatchForIndexing(startTime int64, en
 	return resultVar0, resultVar1
 }
 
-func (s *TimerLayerChannelStore) GetChannelsByIds(channelIds []string) ([]*model.Channel, *model.AppError) {
+func (s *TimerLayerChannelStore) GetChannelsByIds(channelIds []string, includeDeleted bool) ([]*model.Channel, *model.AppError) {
 	start := timemodule.Now()
 
-	resultVar0, resultVar1 := s.ChannelStore.GetChannelsByIds(channelIds)
+	resultVar0, resultVar1 := s.ChannelStore.GetChannelsByIds(channelIds, includeDeleted)
 
 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {
@@ -4444,6 +4444,22 @@ func (s *TimerLayerPostStore) Search(teamId string, userId string, params *model
 	return resultVar0, resultVar1
 }
 
+func (s *TimerLayerPostStore) SearchPostsInTeamForUser(paramsList []*model.SearchParams, userId string, teamId string, isOrSearch bool, includeDeletedChannels bool, page int, perPage int) (*model.PostSearchResults, *model.AppError) {
+	start := timemodule.Now()
+
+	resultVar0, resultVar1 := s.PostStore.SearchPostsInTeamForUser(paramsList, userId, teamId, isOrSearch, includeDeletedChannels, page, perPage)
+
+	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
+	if s.Root.Metrics != nil {
+		success := "false"
+		if resultVar1 == nil {
+			success = "true"
+		}
+		s.Root.Metrics.ObserveStoreMethodDuration("PostStore.SearchPostsInTeamForUser", success, elapsed)
+	}
+	return resultVar0, resultVar1
+}
+
 func (s *TimerLayerPostStore) Update(newPost *model.Post, oldPost *model.Post) (*model.Post, *model.AppError) {
 	start := timemodule.Now()
 
@@ -6264,6 +6280,22 @@ func (s *TimerLayerUserStore) AnalyticsGetSystemAdminCount() (int64, *model.AppE
 	return resultVar0, resultVar1
 }
 
+func (s *TimerLayerUserStore) AutocompleteUsersInChannel(teamId string, channelId string, term string, options *model.UserSearchOptions) (*model.UserAutocompleteInChannel, *model.AppError) {
+	start := timemodule.Now()
+
+	resultVar0, resultVar1 := s.UserStore.AutocompleteUsersInChannel(teamId, channelId, term, options)
+
+	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
+	if s.Root.Metrics != nil {
+		success := "false"
+		if resultVar1 == nil {
+			success = "true"
+		}
+		s.Root.Metrics.ObserveStoreMethodDuration("UserStore.AutocompleteUsersInChannel", success, elapsed)
+	}
+	return resultVar0, resultVar1
+}
+
 func (s *TimerLayerUserStore) ClearAllCustomRoleAssignments() *model.AppError {
 	start := timemodule.Now()