[wip] Bitmap-based frequency aggregations #37
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…aringBitmap object. The response is a byte array from which you can construct a bitmap, using new ImmutableRoaringBitmap(ByteBuffer.wrap(bitmapBytes))
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solr/core/src/java/org/apache/solr/search/facet/BitmapFrequencies.java
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Following from Tim's work on collecting bitmaps of ordinal values, this is a prototype of two new aggregates also based on bitmaps of ordinals:
both support an optional "maxFrequency" param which will cap the frequencies returned, and accumulate values which hit the cap into an overflow bucket (to be returned also)
needs testing for functionality and performance - the hope is that these will be a good alternative to the memory-hungry terms facet used by the mention-service to estimate cardinality for authors in sampled queries