Elastcisearch

Elastic Stack Elasticsearch
1

I am using the last Java Client API for Elasticsearch 7.17.5.
I have a boolean query builder and I want to add conditions before checking if a must clause is already there or not. But the issue is that I can build the query builder only 1 time.
How can I check if a clause is already there without actually calling .build method ?

Or Is it possible to add clause to BoolQuery object that we get after calling build.

       BoolQuery.Builder b = QueryBuilders.bool();
		
		b.filter(QueryBuilders.matchAll().build()._toQuery());
		
		if(b.build().must().isEmpty())
			b.must(QueryBuilders.matchAll().build()._toQuery());
		
		System.out.println(b.build());

This gives [UnsupportedOperationException]

		b.build().must().add(QueryBuilders.matchAll().build()._toQuery())
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