No segments file found in directory files – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.1-8.9

Briefly, this error occurs when Elasticsearch cannot find the segments file in the specified directory. This file is crucial as it contains information about the segments in an index. The absence of this file can be due to accidental deletion or corruption. To resolve this issue, you can restore the segments file from a backup. If a backup is not available, you may need to rebuild the index. Additionally, ensure that Elasticsearch has the necessary read/write permissions for the directory. Regularly backing up your data can prevent such issues in the future.

This guide will help you check for common problems that cause the log ” no segments* file found in ” + directory + “: files: ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, lucene.

Log Context

Log “no segments* file found in ” + directory + “: files: ” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (infoStream != null) {
 message("directory listing gen=" + gen);
 }  if (gen == -1) {
 throw new IndexNotFoundException("no segments* file found in " + directory + ": files: " + Arrays.toString(files));
 } else if (gen > lastGen) {
 String segmentFileName = IndexFileNames.fileNameFromGeneration(IndexFileNames.SEGMENTS; ""; gen);  try {
 T t = doBody(segmentFileName);