backstage/.changeset/light-drinks-rule.md

@backstage/plugin-search-backend, @backstage/plugin-search-backend-node, @backstage/plugin-search-backend-module-elasticsearch, @backstage/plugin-search-backend-module-pg

@backstage/plugin-search-backend	@backstage/plugin-search-backend-node	@backstage/plugin-search-backend-module-elasticsearch	@backstage/plugin-search-backend-module-pg
patch	patch	patch	patch

Use new IndexableResultSet type as return type of query method in SearchEngine implementation.