Java Rest API doesn't work as expected

Hi there,

I'm using mapper plugin to index pdf files, and in Kibana console everything works as expected.
I've tried following request, and ElasticSearch responses with 2 documents:

POST /reports/generated/_search?filter_path=hits.hits._source

Both pdfs contain "USD" word.
But I do the same thing with Java REST API and ElasticSearch cannot make a search in the indexed pdfs.
For querying I'm using following java code:

String query = "{"query":{"query_string":{"query":"" + "USD" + ""}}}";
Response response = restClient.performRequest(
new Hashtable<>(),
new StringEntity(query));

When I change "USD" querying string with another value, which contains another field (not the attachment), then everything is working well. So do I need some configuration in my java restClient to enable context searching in the indexed pdfs?


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