An index is added to symbol_search_documents.unit_id, which should
improve performance for JOINs and DELETEs.
For golang/go#44142
Change-Id: Iedb402904e1665bb91ba8b975f2ecf4d00163dfa
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/335989
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Julie Qiu