Guillotina-elasticsearch

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- Nothing changed yet.

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- Adding search analyzers functionality
[nilbacardit26]

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- Being able to search using multifields
[nilbacardit26]

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- Adding missing index kwarg when deleting the index in the middle
of a migration
[nilbacardit26]

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- Support for elasticsearch 8.
- Changing ES fixture to bitnami version 8. Tests passing for both
versions
- Removing deprecated doc_type argument from get calls.
- Dropping support for elastic search 6.x
[nilbacardit26]

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- Fixing applications in __init__.py: Removing
guillotina_elasticsearch from it