Is there still an impact on performance with sparse documents when store is set to false for all fields (the default)? Based on my reading it would still affect the inverted index in Lucene and also increase the doc value size in Elasticsearch (we're using 2.3).
I'm trying to determine whether to have multiple indexes versus a single index when having multiple types with different fields. I understand in practice it's best to have an index per type, but would like some more concrete evidence to satisfy my customer's curiosity.
Is there a way to measure the sparsity of documents in Elasticsearch or Lucene?