This diff is the final one in the stack. It allows us to actually @-mention a chat with ENS users with a cleared name by the member's wallet addresses. This is done in the same way we construct our search indexes for users - we take all possible search terms into an array for the thread ID and then join them by a space. For reference, here is the code for the user search index.
Part of ENG-5436
Depends on D10460