[Search] Searching Hierarchies with Nested Arrays of Objects

The current Search service supports searching indexed documents with nested structures, but not nested arrays of objects. The ability to search such document structures is important for a number of data types, especially those with indeterminate numbers of members (e.g. events associated with an activity generator, various acquisition data types, and tags on entities with things like data quality tags, etc. It should be possible to execute search queries against such documents once indexed and utilize values in the nested arrays of objects in the queries and responses.