Wildcard.hps

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- Nothing changed yet.

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- missing '.items()'

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- handle unicode for index data derived from IAdditionalIndexDataProvider adapters

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- abstract unicode handling code for hook when getting index data, and handle
tuples, lists, and dict values

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- handle unicode error and fix bug in hook when getting index data

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- allow a custom prefix to be defined for fetching connection settings from the
environment (default to the previous hard-coded 'OPENSEARCH_' value)