Harmonize meta data handling across doc stores #214
Merged
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For document_stores.write_docs(dicts), we want a similar behavior across different types of document stores.
So far the meta data handling was different for elasticsearch, where we just indexed the dictionaries in the same structure as they came in. So if you passed [{"name": "some", "text": "some", "meta":{"author": "some"}}], it would result in the same nested structure in elasticsearch.
This PR makes the behaviour similar to the other document stores by unnesting the "meta" field before indexing.