Determine if a hash fields exists.

    .. versionadded:: 2017.7.0

    CLI Example:

    .. code-block:: bash

        salt '*' redis.hexists foo_hash bar_field

def hexists(key, field, host=None, port=None, db=None, password=None):
    '''
    Determine if a hash fields exists.

    .. versionadded:: 2017.7.0

    CLI Example:

    .. code-block:: bash

        salt '*' redis.hexists foo_hash bar_field
    '''
    server = _connect(host, port, db, password)
    return server.hexists(key, field)