Exception when processing %s with %s – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.8-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while processing a specific operation. The ‘s’ placeholders are typically replaced with the actual values, indicating the operation and the specific issue. The error could be due to various reasons such as incorrect data format, insufficient memory, or network issues. To resolve this, you could check the Elasticsearch logs for more details about the error, ensure that the data format is correct, increase the memory allocation if necessary, or check the network connectivity.

This guide will help you check for common problems that cause the log ” exception when processing [%s] with [%s] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “exception when processing [%s] with [%s]” classname is ThrottledIterator.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            try (var itemRefs = new ItemRefCounted()) {
                itemConsumer.accept(Releasables.releaseOnce(itemRefs::decRef); item);
            } catch (Exception e) {
                logger.error(Strings.format("exception when processing [%s] with [%s]"; item; itemConsumer); e);
                assert false : e;


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