Update dependency elasticsearch-dsl to v7.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
elasticsearch-dsl	==7.3.0 -> ==7.4.0

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Release Notes

elasticsearch/elasticsearch-dsl-py

v7.4.0

Compare Source

• Added the ConstantKeyword, RankFeatures field types (#1456, #1465)
• Added the ScriptScore query type (#1464_)
• Added UpdateByQueryResponse.success() method (#1463_)
• Added return_doc_meta parameter to Document.save() and Document.update() for
  accessing the complete API response (#1466_)
• Added support for calendar_interval and fixed_interval to DateHistogramFacet (#1467_)
• Added Document.exists() method (#1447, contributed by @dem4ply)
• Added support for the year interval to DateHistogramFacet (#1502, contributed by @nrsimha)
• Fixed issue where to_dict() should be called recursively on Search.extras and **kwargs (#1458_)
• Fixed inverse of an empty Bool query should be MatchNone (#1459_)
• Fixed issue between retry_on_conflict and optimistic concurrency control within Document.update() (#1461, contributed by @armando1793)

.. _@​dem4ply: https://github.com/dem4ply
.. _@​nrsimha: https://github.com/nrsimha
.. _@​armando1793: https://github.com/armando1793
.. _#​1447: elastic/elasticsearch-dsl-py#1447
.. _#​1456: elastic/elasticsearch-dsl-py#1456
.. _#​1458: elastic/elasticsearch-dsl-py#1458
.. _#​1459: elastic/elasticsearch-dsl-py#1459
.. _#​1461: elastic/elasticsearch-dsl-py#1461
.. _#​1463: elastic/elasticsearch-dsl-py#1463
.. _#​1464: elastic/elasticsearch-dsl-py#1464
.. _#​1465: elastic/elasticsearch-dsl-py#1465
.. _#​1466: elastic/elasticsearch-dsl-py#1466
.. _#​1467: elastic/elasticsearch-dsl-py#1467
.. _#​1502: elastic/elasticsearch-dsl-py#1502

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