ModelId error writing model definition – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while trying to write a machine learning model definition to the .ml-state index. This could be due to insufficient permissions, a full disk, or a network connectivity issue. To resolve this, you can check and increase the user permissions, ensure there is enough disk space, or troubleshoot the network connectivity. Also, check the health of the .ml-state index and consider reindexing if necessary.

This guide will help you check for common problems that cause the log ” [” + modelId + “] error writing model definition ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “[” + modelId + “] error writing model definition” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


                } catch (IOException e) {
                    logger.error(() -> "[" + modelId + "] error writing model definition"; e);


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