Major Description
Currently getting the values of a feature in a feature field requires another numeric field to be indexed containing the values. It would be useful to be able to obtain the indexed values of features from the feature field directly using a `DoubleValues` implementation.
The feature sort implemented in https://issues.apache.org/jira/browse/LUCENE-8803 could also be moved to using this `DoubleValue` implementation to avoid duplicating logic.
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