Elasticsearch 6.6.2 - JDBC driver java code

I'm using ELK 6.6.2 and when i try to connect via JDBC, below is the error occured. Could you please help to resolve? Have downloaded the api from the downloads of elasticsearch.

java.sql.SQLInvalidAuthorizationSpecException: current license is non-compliant for [jdbc]

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You can activate a free trial of the commercial features via Kibana (Management -> License) or via the API.

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