Opster Team
Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.
To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.
Take a self-guided product tour to see for yourself (no registration required).This guide will help you check for common problems that cause the log ” Missing affix file for hunspell dictionary %s ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: indices, analysis.

Log Context
Log “Missing affix file for hunspell dictionary [%s]”classname is HunspellService.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :
boolean ignoreCase = nodeSettings.getAsBoolean("ignore_case"; defaultIgnoreCase); Path[] affixFiles = FileSystemUtils.files(dicDir; "*.aff"); if (affixFiles.length == 0) { throw new ElasticsearchException(String.format(Locale.ROOT; "Missing affix file for hunspell dictionary [%s]"; locale)); } if (affixFiles.length != 1) { throw new ElasticsearchException(String.format(Locale.ROOT; "Too many affix files exist for hunspell dictionary [%s]"; locale)); } InputStream affixStream = null;
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Arpit Ghiya
Senior Lead SRE at Coupa