Azure.Search: Ensure input and output document order is in sync while batching

[tg-msft]

We need to add (performant) checks that the document order is maintained so customers can just index into the results safely.

[AlexGhiondea]

Do we know if this is supported by the service already (ie. is there already an expectation that the documents will come out in the same order?)

[brjohnstmsft]

@AlexGhiondea It may work by accident, but it's not part of our public contract so there's no guarantee.

[tg-msft]

Moving to the backlog because we don't have enough information today to determine the "key" column of a document. We might at some point in the future when we add FieldBuilder. Until then folks will have to map string Key to their documents by hand if they want to be paranoid about response ordering.

[AlexGhiondea]

Closing for now.