Switch name indexes from GIST -> GIN to improve defn search speed.

Author: ChrisPenner

sql/2026-01-12_use-gin-trigram.sql

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+-- Switch from GIST trigram to GIN trigram for both scoped and global definition search tables.
+-- GIN is slower to build, but faster to search, and we compute the indexes in background jobs anyways.
+
+CREATE INDEX scoped_definition_search_docs_name_trigram_gin ON scoped_definition_search_docs USING GIN (name gin_trgm_ops);
+-- Drop the old GIST trigram index.
+DROP INDEX scoped_definition_search_docs_name_trigram;
+
+
+CREATE INDEX global_definition_search_name_trigram_gin ON global_definition_search_docs USING GIN (name gin_trgm_ops);
+DROP INDEX global_definition_search_name_trigram;