[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

store/searchtest/channel_layer.go

@@ -30,12 +30,12 @@ var searchChannelStoreTests = []searchTest{
 	{
 		Name: "Should be able to autocomplete a channel by a part of its name when has parts splitted by _ character",
 		Fn:   testAutocompleteChannelByNameSplittedWithUnderscoreChar,
-		Tags: []string{ENGINE_MYSQL, ENGINE_ELASTICSEARCH},
+		Tags: []string{ENGINE_MYSQL, ENGINE_ELASTICSEARCH, ENGINE_BLEVE},
 	},
 	{
 		Name: "Should be able to autocomplete a channel by a part of its display name when has parts splitted by whitespace character",
 		Fn:   testAutocompleteChannelByDisplayNameSplittedByWhitespaces,
-		Tags: []string{ENGINE_MYSQL, ENGINE_ELASTICSEARCH},
+		Tags: []string{ENGINE_MYSQL, ENGINE_ELASTICSEARCH, ENGINE_BLEVE},
 	},
 	{
 		Name: "Should be able to autocomplete retrieving all channels if the term is empty",

store/searchtest/post_layer.go

@@ -26,7 +26,7 @@ var searchPostStoreTests = []searchTest{
 	{
 		Name: "Should be able to search for exact phrases in quotes",
 		Fn:   testSearchExactPhraseInQuotes,
-		Tags: []string{ENGINE_ALL},
+		Tags: []string{ENGINE_POSTGRES, ENGINE_MYSQL, ENGINE_ELASTICSEARCH},
 	},
 	{
 		Name: "Should be able to search for email addresses with or without quotes",
@@ -69,8 +69,8 @@ var searchPostStoreTests = []searchTest{
 		Tags: []string{ENGINE_ALL},
 	},
 	{
-		Name: "Should be able to filter messages written on a specific date",
-		Fn:   testFilterMessagesInSpecificDate,
+		Name: "Should be able to filter messages written after a specific date",
+		Fn:   testFilterMessagesAfterSpecificDate,
 		Tags: []string{ENGINE_ALL},
 	},
 	{
@@ -79,8 +79,8 @@ var searchPostStoreTests = []searchTest{
 		Tags: []string{ENGINE_ALL},
 	},
 	{
-		Name: "Should be able to filter messages written after a specific date",
-		Fn:   testFilterMessagesAfterSpecificDate,
+		Name: "Should be able to filter messages written on a specific date",
+		Fn:   testFilterMessagesInSpecificDate,
 		Tags: []string{ENGINE_ALL},
 	},
 	{
@@ -111,7 +111,7 @@ var searchPostStoreTests = []searchTest{
 	{
 		Name: "Should support search with wildcards",
 		Fn:   testSupportWildcards,
-		Tags: []string{ENGINE_ALL},
+		Tags: []string{ENGINE_POSTGRES, ENGINE_MYSQL, ENGINE_ELASTICSEARCH},
 	},
 	{
 		Name: "Should not support search with preceding wildcards",

store/searchtest/testlib.go

@@ -15,6 +15,7 @@ const (
 	ENGINE_MYSQL         = "mysql"
 	ENGINE_POSTGRES      = "postgres"
 	ENGINE_ELASTICSEARCH = "elasticsearch"
+	ENGINE_BLEVE         = "bleve"
 )
 
 type SearchTestEngine struct {

store/searchtest/user_layer.go

@@ -20,12 +20,12 @@ var searchUserStoreTests = []searchTest{
 	{
 		Name: "Should honor channel restrictions when autocompleting users",
 		Fn:   testHonorChannelRestrictionsAutocompletingUsers,
-		Tags: []string{ENGINE_ELASTICSEARCH},
+		Tags: []string{ENGINE_ELASTICSEARCH, ENGINE_BLEVE},
 	},
 	{
 		Name: "Should honor team restrictions when autocompleting users",
 		Fn:   testHonorTeamRestrictionsAutocompletingUsers,
-		Tags: []string{ENGINE_ELASTICSEARCH},
+		Tags: []string{ENGINE_ELASTICSEARCH, ENGINE_BLEVE},
 	},
 	{
 		Name:        "Should return nothing if the user can't access the channels of a given search",
@@ -69,17 +69,17 @@ var searchUserStoreTests = []searchTest{
 	{
 		Name: "Should be able to autocomplete a user by part of its username splitted by Dot",
 		Fn:   testAutocompleteUserByUsernameWithDot,
-		Tags: []string{ENGINE_ELASTICSEARCH},
+		Tags: []string{ENGINE_ELASTICSEARCH, ENGINE_BLEVE},
 	},
 	{
 		Name: "Should be able to autocomplete a user by part of its username splitted by underscore",
 		Fn:   testAutocompleteUserByUsernameWithUnderscore,
-		Tags: []string{ENGINE_ELASTICSEARCH},
+		Tags: []string{ENGINE_ELASTICSEARCH, ENGINE_BLEVE},
 	},
 	{
 		Name: "Should be able to autocomplete a user by part of its username splitted by hyphen",
 		Fn:   testAutocompleteUserByUsernameWithHyphen,
-		Tags: []string{ENGINE_ELASTICSEARCH},
+		Tags: []string{ENGINE_ELASTICSEARCH, ENGINE_BLEVE},
 	},
 	{
 		Name: "Should escape the percentage character",