Returns approximate number of messages of the specified type in the chat or its topic
| chat_id |
Identifier of the chat in which to count messages |
| topic_id |
Pass topic identifier to get number of messages only in specific topic; pass null to get number of messages in all topics |
| filter |
Filter for message content; searchMessagesFilterEmpty is unsupported in this function |
| return_local |
Pass true to get the number of messages without sending network requests, or -1 if the number of messages is unknown locally |