Exception while loading dictionary – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch fails to load a dictionary file, which is often used for analysis purposes such as token filters. This could be due to incorrect file path, missing file, or insufficient permissions. To resolve this, ensure the dictionary file exists at the specified path and Elasticsearch has the necessary permissions to read it. If the file is large, consider using a smaller dictionary or increasing the heap size. Also, check the file format and encoding to ensure they are compatible with Elasticsearch.

This guide will help you check for common problems that cause the log ” exception while loading dictionary {} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: analysis and indices.

Log Context

Log “exception while loading dictionary {}” classname is HunspellService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                                 try {
                                } catch (UncheckedExecutionException e) {
                                    // The cache loader throws unchecked exception (see #loadDictionary());
                                    // here we simply report the exception and continue loading the dictionaries
                                    logger.error("exception while loading dictionary {}"; file.getFileName(); e);


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