Support Delete by query with es parameters.

[youssef3wi]

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Closes #2865

[sothawo]

Thanks for your PR. I see two main issues:

1. I don't think that DeleteQuery should derive from BaseQuery. This makes it implement the Query interface and so it could be used anywhere where a Query is expected, in searches, highlight etc. We'd need checks at any place where a Query is processed, that it is not a DeleteQueryas this makes no sense. It should contain a Query, that's ok. Like UpdateQuery it should be an independent top level class with it's builder.
2. import of Elasticsearch classe, i left a note and the point in the DeleteQuery file.

[sothawo]

One nullability issue, otherwise some minor comments