An index "bucket" with a label string and type. It is referenced by {@link AlphabeticIndex#getBucketIndex(CharSequence)}and {@link AlphabeticIndex.ImmutableIndex#getBucketIndex(CharSequence)}, returned by {@link AlphabeticIndex.ImmutableIndex#getBucket(int)}, and {@link AlphabeticIndex#addRecord(CharSequence,Object)} adds a recordinto a bucket according to the record's name.
@param < V> Data type
@stable ICU 4.8
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