assertDocValuesEquals should support sparse sorted doc_values #14839
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In LuceneTestCase, assertDocValuesEquals compares the doc_values in two indices. For SortedSetDocValues, as well as other doc value types, it does not assume that every document has a value. But for SortedDocValues, it requires that every doc have a value. This restricts what indices
assertDocValuesEquals
can be used to test. So this PR removes this restriction and does not assume that every doc has a value.