[FEATURE] Support data stream deletion

[svdasein]

It looks like opensearch-ruby doesn't yet have any code to support DELETE _data_stream/

Minus this it seems the only workaround would be to manipulate transport more manually so as to construct the above.

If this isn't there somewhere yet, we need it.

[nhtruong]

Thanks for bringing this up. I've added a new ticket to the API repo regarding this missing API action. We will generate this action with an api generator similar to this one.