Document structure of solr document is as mentioned below now i need to get
the document having event_name="product view" and group it by email so that
email is not duplicate.Now on listing the email how may paginate the unique
email.As the query return total number of document not the count of groups
"docs":[ { "id":"1", "email":"xxx...@gmail.com", "gender":"M",
"location":["yyy"], "created":123444, "event_name":"product viewed",
"event_property":"product", "event_value":"sun glassed",
"version":1617201602734587904, "location_str":["yyyy"] }, { "id":"4",
"email":"xxx...@gmail.com", "gender":"F", "location":["zzzz"],
"created":123447, "event_name":"Add To Cart", "event_property":"Name",
"event_value":"sun glasses", "version":1617202784870858752,
"location_str":["zzzz"] }, { "id":"5", "email":"xxx...@gmail.com",
"gender":"M", "location":["kkkkk"], "created":123464, "event_name":"Product
Clicked", "event_property":"Category", "event_value":"Contact Lens",
"version":1617202784871907328, "location_str":["lllll"] } ]
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