ElasticSearch composite ID

问题

I am using elasticsearch-py to insert data. Currently, my _id field is something like this:

_id: "{'hostname': 'xxxxx', 'day': '2016-03-22', 'service': 'xxxxxxxx'}"

My manager told me this is not a good id. I think it's ok. With ElasticSearch, can i have an id composed of several attributes ?

Eg:

_id: {
    hostname: "xxxxxx",
    day: "2016-03-22",
    service: "xxxxxxxx"
}

A second solution is to encode my string in base64 with python.

来源：https://stackoverflow.com/questions/36174474/elasticsearch-composite-id