add note about skipping index check to search docs

Author: hectorsector

contributing/search.md

@@ -135,3 +135,4 @@ Each record represents a section of a page. Sections are derived by splitting up
 - Our search querying has typo tolerance. Try spelling something wrong and see what you get!
 - Our search querying has lots of controls for customizing each index, so we can add weights to certain attributes and create rules like "title is more important than body", etc. But it works pretty well as-is without any configuration.
 - Our search querying has support for "advanced query syntax" for exact matching of quoted expressions and exclusion of words preceded by a `-` sign. This is off by default but we have it enabled in our browser client. The settings in the web interface can be overridden by the search endpoint. See [middleware/search.js]([middleware/search.js).
+- When needed, the Docs Engineering team can commit updates to the search index, as long as the label `skip-index-check` is applied to the PR.