High Level REST client error with org.elasticsearch.client library 7.3.1

Elastic Stack Elasticsearch
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Hi

I tried to use org.elasticsearch.client.RestClientBuilder (version 7.3.1) but encountered the following error. Does anyone know if this is a bug in the library file or how to resolve this?
I am using this library in cloudera nifi

Unhandled java.lang.NoClassDefFoundError: Could not initialize class org.apache.http.impl.nio.conn.ManagedNHttpClientConnectionFactory

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