How to retain only one record from duplicate records?

I have a database with duplicate results, i need to delete all other results and retain one.
I have the query to find duplicate records
POST /data_12/_search
{
"size": 0,
"aggs": {
"duplicateCount": {
"terms": {
"field": "col2.keyword",
"min_doc_count": 2,
"size": 10
},
"aggs": {
"duplicateDocuments": {
"top_hits": {
"size": 100
}
}
}
}
}
}

Please help me with the delete query

Could you make col2 your choice of ID for the elasticsearch document to avoid this situation in the first place?

I donot get your point @Mark_Harwood

Elasticsearch IDs are the equivalent of a primary key - it ensures there’s only one doc with that ID. If you don’t supply an ID (and many don’t) elasticsearch invents a new unique one. If you do supply an ID it checks to see if this already exists

Please tell me procedure or code? Should I change in the ES template or should I change in the query?
If in the query then how to do it?

It’s not the template or the query. It’s the client that does the write - as well as giving the JSON body you can also pass an ID in our write APIs