Did you try the following query?
"query":{
    "filtered" : {
        "filter" : {
            "bool" : {
                "should" : [
                    {"term" : { "field_B" : "aaaa" }},
                    {"term": {"field_B": "bbb"}}
                ]
            }
        }
    }
  },
    "facets" : {
        "tag" : {
            "terms" : {
                "field" : "field_A"
            }
        }
    }
}


Plz confirm if it works for you.

On Monday, 7 July 2014 15:56:53 UTC+5:30, 闫旭 wrote:
>
>  Dear All!
> I have some docs:
> {"field_A":"aaa","field_B":"bbb"}
> {"field_A":"aaa","field_B":"ccc"}
> {"field_A":"bbb","field_B":"bbb"}
> {"field_A":"bbb","field_B":"bbb"}
> {"field_A":"bbb","field_B":"eee"}
> {"field_A":"aaa","field_B":"aaaa"}
> {"field_A":"ccc","field_B":"aaaa"}
> first step:
> {
>   "query":{
>     "filtered" : {
>         "filter" : {
>             "bool" : {
>                 "must" : {
>                     "term" : { "field_B" : "bbb" }
>                 }
>             }
>         }
>     }
>   },
>     "facets" : {
>         "tag" : {
>             "terms" : {
>                 "field" : "field_A"
>             }
>         }
>     }
> }
> first result:
> {
> ...
> {"term":"aaa","count":1},
> {"term":"bbb","count":2},
> ...
> }
> -------------------------------------------------------------------------
> second step:
> the second facets:
> {
>   "query":{
>     "filtered" : {
>         "filter" : {
>             "bool" : {
>                 "must" : {
>                     "term" : { "field_B" : "aaaa" }
>                 }
>             }
>         }
>     }
>   },
>     "facets" : {
>         "tag" : {
>             "terms" : {
>                 "field" : "field_A"
>             }
>         }
>     }
> }
> second result:
> {
> ...
> {"term":"aaa","count":1}.
> {"term":"ccc","count":1}
> ...
> }
>
> -----------------------------------------------------------------------------
> third step:
> combine the two result with interesction operation with "term":
> {"term":"aaa","count":"I don't care the count value."}
>
>
> -----------------------------------------------------------------------------
> Now, How can i combine the three steps in one filter facets or othen 
> method??
>
>
> Thx All!!
>
> 

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