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It will keep using the caching terms enum for keyword/text fields and falls back to IndexSearcher.count for fields that do not use the inverted index for searching (such as numbers and ip addresses). Note that this probably means that significant terms aggregations on these fields will be less efficient than they used to be. It should be ok under a sampler aggregation though. This moves tests back to the state they were in before numbers started using points, and also adds a new test that significant terms aggs fail if a field is not indexed. In the long term, we might want to follow the approach that Robert initially proposed that consists in collecting all documents from the background filter in order to compute frequencies using doc values. This would also mean that significant terms aggregations do not require fields to be indexed anymore.