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User reports indicate that using stats.field={!cardinality=1.0}foo on a field that has extremely high cardinality on a single shard (example: 150K unique values) can lead to "ArrayIndexOutOfBoundsException: 3" on the shard during serialization of the HLL values.
using "cardinality=0.9" (or lower) doesn't produce the same symptoms, suggesting the problem is specific to large log2m and regwidth values.
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