Index directory indexPath must exist and be a directory – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch cannot find the specified index directory or the path does not lead to a directory. This could be due to incorrect configuration or the directory may have been deleted or moved. To resolve this, ensure the directory exists at the specified path and it is a directory, not a file. Check your configuration files for any typographical errors in the directory path. If the directory was moved or deleted, restore it or update the path in your configuration to the new location.

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This guide will help you check for common problems that cause the log ” index directory [” + indexPath + “]; must exist and be a directory ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, shard.

Log Context

Log “index directory [” + indexPath + “]; must exist and be a directory” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 final Path path = getPath(folderOption.value(options)).getParent();
 final Path shardParent = path.getParent();
 final Path shardParentParent = shardParent.getParent();
 final Path indexPath = path.resolve(ShardPath.INDEX_FOLDER_NAME);
 if (Files.exists(indexPath) == false || Files.isDirectory(indexPath) == false) {
 throw new OpenSearchException("index directory [" + indexPath + "]; must exist and be a directory");
 }  final String shardIdFileName = path.getFileName().toString();
 final String nodeIdFileName = shardParentParent.getParent().getFileName().toString();
 final String indexUUIDFolderName = shardParent.getFileName().toString();


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