def multi_match_query(query, fields, size=10, fuzziness=None):
    """Returns the body of the multi_match query in Elasticsearch with possibility of setting
    the fuzziness on it"""
    query = {
        "query": {
            "multi_match": {
                "query": query,
                "fields": fields
            }
        },
        "size": size
    }
    if fuzziness:
        query["query"]["multi_match"]["fuzziness"] = fuzziness
    return query