types.Query truncates int64 in its custom MarshalJSON implementation.

Probably happens because here you marshal Query into JSON and then turn it into map[string]any. json package probably convert int64 into float and this causes loss of precision.

As a result this query fails for me because tags value changes.

{
    "from": 0,
    "query": {
        "bool": {
            "must": [
                {
                    "terms": {
                        "tags": [
                            4475034517144338534
                        ]
                    }
                }
            ]
        }
    },
    "size": 20
}

4475034517144338534 gets truncated to 4475034517144338400

package main

import "encoding/json"

type Issue1021 struct {
	Value int64
}

func main() {
	v := Issue1021{
		Value: 4475034517144338534,
	}
	jsonV, _ := json.Marshal(v)
	println(string(jsonV))
	var tmp map[string]any
	json.Unmarshal(jsonV, &tmp)
	jsonV2, _ := json.Marshal(tmp)
	println(string(jsonV2))
}

{"Value":4475034517144338534}
{"Value":4475034517144338400}