ElasticSearch group by aggregation query -


i have question regarding requirement in elastic-search. have following documents in index.

{     "name":"a1",     "userid": 1,     "tag":"tag1" },  {     "name":"abc",     "userid":1,     "tag":"tag2" },  {     "name":"a2",     "userid":2,     "tag":"tag1" },  {     "name":"abc2",     "userid":2,     "tag":"tag2" },  {     "name":"abc3",     "userid":2,     "tag":"tag3" }

now if query fetch me documents userid has tag values "tag1" , "tag3" i.e. in case documents returned 

{     "name":"a2",     "userid":2,     "tag":"tag1" } {     "name":"abc3",     "userid":2,     "tag":"tag3" }

so in case document containing tag values "tag1" userid 1 not returned userid not have document "tag3".

i checking on nested bucket aggregation stuck. can please suggest elastic query required this.


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