Field collapsing is coming in a future version of ES. For now, you can use
a terms facet and the all_terms option:
{
"query" : {
"match_all" : { }
},
"facets" : {
"tag" : {
"terms" : {
"field" : "distinctid",
"all_terms" : true
}
}
}
}
And then in the result, just count the total number of entries in the terms
array.
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