Add Purpose as a searchable field (#8067)

* Add Purpose as a searchable field

* Add New Index and Remove old for Channels

* Include Purpose in FullTextSearch Clause

* Move removeIndex for Channels into upgrade.go

store/storetest/channel_store.go

@@ -1708,6 +1708,14 @@ func testChannelStoreSearchMore(t *testing.T, ss store.Store) {
 	o8.Type = model.CHANNEL_PRIVATE
 	store.Must(ss.Channel().Save(&o8, -1))
 
+	o9 := model.Channel{}
+	o9.TeamId = o1.TeamId
+	o9.DisplayName = "Channel With Purpose"
+	o9.Purpose = "This can now be searchable!"
+	o9.Name = "with-purpose"
+	o9.Type = model.CHANNEL_OPEN
+	store.Must(ss.Channel().Save(&o9, -1))
+
 	if result := <-ss.Channel().SearchMore(m1.UserId, o1.TeamId, "ChannelA"); result.Err != nil {
 		t.Fatal(result.Err)
 	} else {
@@ -1773,6 +1781,19 @@ func testChannelStoreSearchMore(t *testing.T, ss store.Store) {
 		}
 	}
 
+	if result := <-ss.Channel().SearchMore(m1.UserId, o1.TeamId, "now searchable"); result.Err != nil {
+		t.Fatal(result.Err)
+	} else {
+		channels := result.Data.(*model.ChannelList)
+		if len(*channels) != 1 {
+			t.Fatal("should return 1 channel")
+		}
+
+		if (*channels)[0].Name != o9.Name {
+			t.Fatal("wrong channel returned")
+		}
+	}
+
 	/*
 		// Disabling this check as it will fail on PostgreSQL as we have "liberalised" channel matching to deal with
 		// Full-Text Stemming Limitations.
@@ -1884,6 +1905,14 @@ func testChannelStoreSearchInTeam(t *testing.T, ss store.Store) {
 	o11.Type = model.CHANNEL_OPEN
 	store.Must(ss.Channel().Save(&o11, -1))
 
+	o12 := model.Channel{}
+	o12.TeamId = o1.TeamId
+	o12.DisplayName = "Channel With Purpose"
+	o12.Purpose = "This can now be searchable!"
+	o12.Name = "with-purpose"
+	o12.Type = model.CHANNEL_OPEN
+	store.Must(ss.Channel().Save(&o12, -1))
+
 	for name, search := range map[string]func(teamId string, term string) store.StoreChannel{
 		"AutocompleteInTeam": ss.Channel().AutocompleteInTeam,
 		"SearchInTeam":       ss.Channel().SearchInTeam,
@@ -1986,6 +2015,19 @@ func testChannelStoreSearchInTeam(t *testing.T, ss store.Store) {
 					t.Fatal("wrong channel returned")
 				}
 			}
+
+			if result := <-search(o1.TeamId, "now searchable"); result.Err != nil {
+				t.Fatal(result.Err)
+			} else {
+				channels := result.Data.(*model.ChannelList)
+				if len(*channels) != 1 {
+					t.Fatal("should return 1 channel")
+				}
+
+				if (*channels)[0].Name != o12.Name {
+					t.Fatal("wrong channel returned")
+				}
+			}
 		})
 	}
 }