Add CommonRequestOptions to constructor of ScrollPublisher and SearchIterator

[ChrisMcD1]

It seems that currently there is no way to make the ScrollPublisher include authentication in its request to elasticsearch, since it calls the execute method internally, but has no way to pass in the CommonRequestOptions that would contain that authentication.

Given that the ScrollPublisher has a singular SearchRequest in its construction, I think it makes sense to include the options for that request alongside it.

I noticed the same thing in SearchIterator, and added it to

I also searched around the code base, and it seems that the following other classes have calls to ElasticClient.execute, and no way to pass options to them. However, they do not have their request object taken in at construction, and I am not currently using any of them, so I wasn't sure what the best way to pass in the options to them would be.

• BulkIndexingSubscriber
• BatchElasticSink
• ElasticSource

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If anyone has a workaround to get authentication working with these at all in the interim, I would love to hear it! Currently planning to vendor this dependency with these patches.

[ChrisMcD1]

Also, this will need to be integrated with #3724, depending on who merges first