The bot-messages channel is hard to search

[eepykate]

Example:

1. Search in:bot-messages <user-id> message deletion
2. Search in:bot-messages message deletion showcase
3. Search in:bot-messages <user-id>
4. Search in:bot-messages <user-id> <content-of-message>

Expected behavior:

1. should show deletions by user-id.
2. should show deletions in showcase.
3. shows deleted & edited messages by user-id.
4. shows deleted & edited messages by user-id including content-of-message

Actual behavior:

1. doesn't work
2. doesn't work
3. works
4. doesn't work