Opster Team
Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.
To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.
This guide will help you check for common problems that cause the log ” Using as http transport; overridden by ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: transport.

Log Context
Log “Using [{}] as http transport; overridden by [{}]” classname is HttpServerModule.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
} public void setHttpServerTransport(Class extends HttpServerTransport> httpServerTransport; String source) { Preconditions.checkNotNull(httpServerTransport; "Configured http server transport may not be null"); Preconditions.checkNotNull(source; "Plugin; that changes transport may not be null"); logger.info("Using [{}] as http transport; overridden by [{}]"; httpServerTransportClass.getName(); source); this.httpServerTransportClass = httpServerTransport; } }
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Jose Rafaelly
Head of System Engineering at Everymundo