Fix DeprecationWarning's from elasticsearch-py.

[arnau126]

See elastic/elasticsearch-py#1698 for more information.
Fixes #1551 .

[cla-checker-service]

💚 CLA has been signed

[sethmlarson]

Thanks for this, if we're making this change we need to make the minimum required elasticsearch package to be 7.14.0 as we're now using document= instead of body=.

[arnau126]

We can also do something like:

        if elasticsearch.__version__ >= (7, 14, 0):
            key = 'document'
        else:
            key = 'body'
        meta = es.index(
            index=self._get_index(index),
            **{key: self.to_dict(skip_empty=skip_empty)},
            **doc_meta
        )

[arnau126]

@sethmlarson Please, let me know if anything else is required.
(I've rebased the branch).

[anze3db]

Could we get a new release with this patch? We are drowning in deprecation warnings 😢

Happy to help if anything else needs to be done before the release, let me know!

[sethmlarson]

Thanks for this, I've created a separate PR which fixed the deprecations for all APIs. The fix is available on v7.4.1 on PyPI.