Failing to connect my java class with Elastic Search Using API

Sir,
How can i use the given query in my java class with sql format
POST _sql?format=txt
{
"query": "select name, from index_name"
}

How to write its equivalent query in my java class

I think it's the same question as in How to convert and use an API query into equivalent SQL query in a java class

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Apology Sir,
I will take care of it from next time.