Failed to create new reader – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch is unable to create a new reader due to issues like insufficient system resources, corrupted indices, or incorrect file permissions. To resolve this, you can try increasing system resources, repairing or deleting corrupted indices, or checking and correcting file permissions. Additionally, ensure that the Elasticsearch process has the necessary read/write permissions to the data directory.

This guide will help you check for common problems that cause the log ” failed to create new reader ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “failed to create new reader” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                     throw new IllegalStateException("failed to open a shadow engine after" +
                            nonexistentRetryTime + "ms; " +
                            "directory is not an index");
            } catch (Throwable e) {
                logger.warn("failed to create new reader"; e);
                throw e;
            } finally {
                if (success == false) {


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