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Indices Exists
editIndices Exists
editUsed to check if the index (indices) exists or not. For example:
HEAD twitter
The HTTP status code indicates if the index exists or not. A 404 means
it does not exist, and 200 means it does.
This request does not distinguish between an index and an alias,
i.e. status code 200 is also returned if an alias exists with that name.