Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/platform/services/searchengine/interface.go

@@ -0,0 +1,49 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package searchengine
+
+import (
+	"time"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+)
+
+type SearchEngineInterface interface {
+	Start() *model.AppError
+	Stop() *model.AppError
+	GetFullVersion() string
+	GetVersion() int
+	GetPlugins() []string
+	UpdateConfig(cfg *model.Config)
+	GetName() string
+	IsActive() bool
+	IsIndexingEnabled() bool
+	IsSearchEnabled() bool
+	IsAutocompletionEnabled() bool
+	IsIndexingSync() bool
+	IndexPost(post *model.Post, teamId string) *model.AppError
+	SearchPosts(channels model.ChannelList, searchParams []*model.SearchParams, page, perPage int) ([]string, model.PostSearchMatches, *model.AppError)
+	DeletePost(post *model.Post) *model.AppError
+	DeleteChannelPosts(channelID string) *model.AppError
+	DeleteUserPosts(userID string) *model.AppError
+	// IndexChannel indexes a given channel. The userIDs are only populated
+	// for private channels.
+	IndexChannel(channel *model.Channel, userIDs, teamMemberIDs []string) *model.AppError
+	SearchChannels(teamId, userID, term string, isGuest bool) ([]string, *model.AppError)
+	DeleteChannel(channel *model.Channel) *model.AppError
+	IndexUser(user *model.User, teamsIds, channelsIds []string) *model.AppError
+	SearchUsersInChannel(teamId, channelId string, restrictedToChannels []string, term string, options *model.UserSearchOptions) ([]string, []string, *model.AppError)
+	SearchUsersInTeam(teamId string, restrictedToChannels []string, term string, options *model.UserSearchOptions) ([]string, *model.AppError)
+	DeleteUser(user *model.User) *model.AppError
+	IndexFile(file *model.FileInfo, channelId string) *model.AppError
+	SearchFiles(channels model.ChannelList, searchParams []*model.SearchParams, page, perPage int) ([]string, *model.AppError)
+	DeleteFile(fileID string) *model.AppError
+	DeletePostFiles(postID string) *model.AppError
+	DeleteUserFiles(userID string) *model.AppError
+	DeleteFilesBatch(endTime, limit int64) *model.AppError
+	TestConfig(cfg *model.Config) *model.AppError
+	PurgeIndexes() *model.AppError
+	RefreshIndexes() *model.AppError
+	DataRetentionDeleteIndexes(cutoff time.Time) *model.AppError
+}