[LUCENE-8367] Make per-dimension drill down optional for each facet dimension

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 7.5, 8.0
• Component/s: modules/facet
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Michael McCandless
• Created: 22/Jun/18 00:50
• Updated: 28/Aug/22 15:31
• Resolved: 27/Jun/18 19:58

Description

Today, when you index a FacetField with path foo/bar, we index two drill down terms onto the document: foo and foo/bar.

But I suspect some users (like me!) don't need to drilldown just on foo (effectively "find all documents that have any value for this facet dimension"), so I added an option to FacetsConfig to let you specify per-dimension whether you need to drill down (defaults to true, matching current behavior).

I also added hashCode and equals to the LongRange and DoubleRange classes in facets module, and improved CheckIndex a bit to print the total %deletions across the index.