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Paul Chobert
b6798a1353
Room topics are dropped from the search index whenever the `event_search` background reindex runs (e.g. after a search index rebuild, or when the background update is re-run on an upgraded homeserver), making topics unsearchable even though the live write path indexes them correctly. The cause is a trailing comma in `_background_reindex_search`, which turns the topic `value` into a 1-tuple instead of a string: https://github.com/element-hq/synapse/blob/14c96c0f5444cbe28b6ac0361cf94216b8d352db/synapse/storage/databases/main/search.py#L211-L213 The downstream `if not isinstance(value, str): continue` guard then silently skips *every* `m.room.topic` event, so no topic ever reaches `event_search` during a reindex. The regression was introduced in #18195, which added rich-text topic support (MSC3765) to the reindex path. ### Problem Example 1. A room has topic "project roadmap". 2. An admin rebuilds the search index (or the `event_search` background update re-runs). 3. `m.room.message` and `m.room.name` events are reindexed fine, but every `m.room.topic` event is skipped. 4. Searching for "project roadmap" with key `content.topic` returns 0 results — the topic is permanently unsearchable until the event is sent again. --- ### Pull Request Checklist <!-- Please read https://element-hq.github.io/synapse/latest/development/contributing_guide.html before submitting your pull request --> * [x] Pull request is based on the develop branch * [x] Pull request includes a [changelog file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog). The entry should: - Be a short description of your change which makes sense to users. "Fixed a bug that prevented receiving messages from other servers." instead of "Moved X method from `EventStore` to `EventWorkerStore`.". - Use markdown where necessary, mostly for `code blocks`. - End with either a period (.) or an exclamation mark (!). - Start with a capital letter. - Feel free to credit yourself, by adding a sentence "Contributed by @github_username." or "Contributed by [Your Name]." to the end of the entry. * [x] [Code style](https://element-hq.github.io/synapse/latest/code_style.html) is correct (run the [linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters))