Add bill type matches to tag search results

[antidipyramid]

Overview

See title.

Connects #1026

Notes

The tags displayed below a search result:

include not only formal "topics" but also locations, programs, policies, bill types, etc.

I think it would be a good idea to match users' tag searches over all of those values. We could add a combined tags field to the search index to easily query tags with sqs.filter(tags__in=[search_term]).

Testing Instructions

• Search for a bill type (e.g. Informational Report)
• Click Tag search
• Verify that this yields all matching bill types
• Verify that a tag search for a topic and a bill type works as expected

[hancush]

I think it would be a good idea to match users' tag searches over all of those values.

This is a great idea. As a stopgap to the combined index field, could we update this query to search all of the fields you mention?

[hancush]

Thanks! Let's get this important fix up on the live site.