Hi all,

I am facing a problem. 

Problem is:

I have updated 2500000 data to solr. 


and some of data have "category" field and some of don't have.

for example.


{
"id":"321",
"name":"anurag",
"category":"x"
},
{
"id":"3",
"name":"john"
}


now i want to search that data who does not have that field. 

what query should like. 


please reply 

It is very urgent - i have to complete this task by today itself 

thanks in advance.



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