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async def rollover(es, params):
    """
    Runs a rollover operation against Elasticsearch.

    It expects the parameter hash to contain a key "alias" specifying the alias to rollover
    as well as a key "body" containing the actual rollover request and associated conditions.

    """
    await es.indices.rollover(alias=params["alias"], body=params["body"])
    return 1, "ops"