docs: fixing broken es for auto-complete

README.md

@@ -58,3 +58,20 @@ tootctl accounts create <username> --email <email> --confirmed --role admin
 Mastodon expects secrets generated by specific tools. Uou can run these commands via the scripts interface with `abra`.
 
 `abra app cmd <domain> secrets --local`
+
+## Tips & Tricks
+
+### Auto-complete is not working?
+
+Check the [sidekiq logs](https://social.lumbung.space/sidekiq/retries), is a bunch of stuff failing? What is the error?
+
+If it looks anything like `blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];` then it might mean that your elastic search service has put itself into "read-only" state. This could be due to running close to no free disk space one time. ES doesn't undo this state, even when you have more free disk space once more, so you need to handle this manually:
+
+```
+abra app run <domain> es bash
+curl -XPUT -H "Content-Type: application/json" http://localhost:9200/_all/_settings -d '{"index.blocks.read_only_allow_delete": null}'
+```
+
+Then head back to the sidekiq retries panel and retry one job. You should see
+the ticket of retries go down by one if if passed. Then you can "retry all" and
+they should get scheduled & run.