Terms Lookup By Query

Add support for looking up filter terms using the results of a filter.
A filter can be used to gather a set of results and the specified
"path" field value will be extracted from each matching
document and used as a filter term.

The query lookup is cached by default to avoid redundant lookups and
the field data cache is used during lookup and document filtering to
improve performance when the number of terms is high.

There is a significant performance improvement when performing the
lookup on numeric fields since we don't use BytesRef's avoiding the
costly conversion of the numeric value to a string and copying the
resulting bytes into the BytesRef.  Performance is also improved by
using the BloomFilter mode which creates a bloom filter based on
terms from the matching filter documents.  Each document matching
the original query is then checked against the BloomFilter to
determine if it is a hit or not.