Hey guys,

I was working with the percolator earlier today, and I thought of a nice way to improve its api. So, right now, if I register a query using the percolator:

curl -XPUT localhost:9200/_percolator/test/kuku -d '{
    "query" : {
        "term" : {
            "field1" : "value1"
        }
    }
}'

and I percolate a matching document

curl -XGET localhost:9200/test/type1/_percolate -d '{
    "doc" : {
        "field1" : "value1"
    }
}'

I get something of the effect back:

{"ok":true, "matches":["kuku"]}

Which a fine way of doing things, but I think it'd be nicer to be able to register metadata along with the query. So, something of the effect:

curl -XPUT localhost:9200/_percolator/test/ -d '{
    "query" : {
        "term" : {
            "field1" : "value1"
        }
    },
    "meta": {
        "campaign": 1,
        "user_id": 1,
        "user_name": kuku
    }
}'

If a document matched, I'd get something like this back:

{"ok":true, "matches":[{"_id": "BzA9dR7OSqGylX-0y80IJA", "campaign": 1, "user_id": 1, "user_name": kuku}]}

Currently, if I need to store more information about a query, I need to do hacks, such as concatenating strings with all the information I want to get back from that match (example: "campaign:1-id:1-name:kuku") to use as the id of that document, but that has drawbacks.

What do you guys think?