ElasticSearch: Check if a field is informed - elasticsearch

Question

I'm using ElasticSearch as primary backend infrastructure.
Currently, I need to know whether a field is informed, so, I need to know #documents with a field 'x' > 0.
Imagine a collection with these two documents:
[ {
"_index" : "living_v1",
"_type" : "fuas",
"_id" : "58fb4509-9452-11e6-a361-02420a016207",
"_score" : 1.0,
"_routing" : "living_team",
"_source" : {
"user" : "living_team",
"timestamp" : "2016-10-17T10:29:27.037Z",
"startTimestamp" : "2016-10-17T10:29:27.037Z",
"dueTimestamp" : null,
"closingTimestamp" : null,
"matter" : "FUA1",
"comment" : null,
"status" : 0,
"backlogStatus" : 20,
"metainfos" : {
"cabeaacaceaacadeaacaeeaacafeaa" : [ "s11" ],
"cdbccaeacdbccaeacdbccaeacdbccaeacdbccaea_ldate" : [ "2016-10-19T07:08:23.130Z" ]
},
"resources" : [ ],
"notes" : null
}
}, {
"_index" : "living_v1",
"_type" : "fuas",
"_id" : "2298eab3-9a8a-11e6-8f4a-02420a010a07",
"_score" : 1.0,
"_routing" : "living_team",
"_source" : {
"user" : "living_team",
"timestamp" : "2016-10-25T09:53:23.078Z",
"startTimestamp" : "2016-10-25T09:53:23.078Z",
"dueTimestamp" : null,
"closingTimestamp" : null,
"matter" : "FUA2",
"comment" : null,
"status" : 0,
"backlogStatus" : 20,
"metainfos" : {
"aecfacebfaaecfcebfaaecfcebfaaecfcebfaaecfcebfa" : [ "s22" ]
},
"resources" : [ ],
"notes" : null
}
} ]
I'd like to know how many documents have a field status informed. For example, if I want to know if a field named exfield is informed, the response will be NO, nevertheless, if I want to know if a field named matter is informed the response will be YES.
Does exist anyway to do that?