Repeating again will return a single results, and repeating again gives no results. This pattern seems to continue forever.
An interesting note, is that when I do Get by ID for this index/type/id, my first search returns the hit quickly, and the second repeated search will hang (seemingly indefinitely) with no response.
just to try things out - sounds as if one shard is not reachable and you are running into a timeout and then nothing is returned. By setting the preference parameter you can hit the same shard with a query and see if only one shard is causing that behaviour, and then take a closer look at the node hosting that shard.
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