Briefly, this error occurs when Elasticsearch is unable to fully read the response for a handler, possibly due to network issues, or the response being too large. To resolve this, you can try increasing the http.max_content_length setting in Elasticsearch to allow larger responses. Alternatively, you can check your network connection and ensure it’s stable. If the issue persists, consider breaking down your queries into smaller ones to reduce the size of the response.
This guide will help you check for common problems that cause the log ” Message not fully read (response) for [{}] handler {}; error [{}]; resetting ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: handler and netty.
Log Context
Log “Message not fully read (response) for [{}] handler {}; error [{}]; resetting” classname is MessageChannelHandler.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
// if its null; skip those bytes
buffer.readerIndex(markedReaderIndex + size);
}
if (buffer.readerIndex() != expectedIndexReader) {
if (buffer.readerIndex()
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