add sort converter to elasticsearch search repository

[indiepopart]

Fix #17018

Add SortToFieldSortBuilderConverter for SearchRepositoryInternal to append ".keyword" suffix to sort property for elasticsearch paginated queries.

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[CLAassistant]

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[Tcharl]

Marvelous!
Is it possible to add a small unit test? At least one to check the presence of the builder source.

[indiepopart]

Marvelous! Is it possible to add a small unit test? At least one to check the presence of the builder source.

Working on it, thank you.