Max_score is not coming for query with filter search

Hi,

I'm doing the below query to fetch data date wise. But in the result the
score is coming as null. How to get the score here.

curl -XPOST "10.203.251.142:9200/aricloud/_search" -d
'{
"query": {
"filtered": {
"query" : {
"match" : {
"CLOUD_TYPE" : "AWS-EC2"
}
},
"filter": {
"range": {
"NODE_CREATE_TIME": {
"to": "2014-03-14 18:43:55",
"from": "2014-03-14 16:22:32"
}
}
}
}
},
"sort" : {"NODE_ID" : "desc"},
"from" : 0,
"size" : 3
}'
==>
{
"took": 1,
"timed_out": false,
"_shards": {
"total": 3,
"successful": 3,
"failed": 0
},
"hits": {
"total": 5,
"max_score": null,
"hits": [
{
"_index": "aricloud",
"_type": "nodes",
"_id": "4",
"_score": null,
"_source": {
"NODE_ID": "12334",
"CLOUD_TYPE": "AWS-EC2",
"NODE_GROUP_NAME": "DATABASE",
"NODE_CPU": "5GHZ",
"NODE_HOSTNAME": "virtualnode.aricent.com",
"NODE_NAME": "aws-node4",
"NODE_PRIVATE_IP_ADDRESS": "10.123.124.126",
"NODE_PUBLIC_IP_ADDRESS": "125.31.108.72",
"NODE_INSTANCE_ID": "asw126",
"NODE_STATUS": "STOPPED",
"NODE_CATEGORY_ID": "14",
"NODE_CREATE_TIME": "2014-03-14 16:35:35"
},
"sort": [
"12334"
]
}
]
}
}

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My first question is: why do you want the score? The score is used only for
sorting, and you're sorting on NODE_ID.

If you really want it (and there is a cost to computing the score) then you
can set track_scores to true.
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-sort.html#_track_scores

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