Cannot be empty – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch receives a request with an empty field that is required to be filled. This could be an index name, document ID, or any other mandatory field. To resolve this issue, ensure that all required fields in your request are filled with valid data. If you’re using a script or application to send requests, check the code to ensure it’s correctly assigning values to all necessary fields. Also, ensure that the data source feeding into the request isn’t returning empty values.

This guide will help you check for common problems that cause the log ” cannot be empty ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “cannot be empty” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 validate(repositoryName; snapshotName);
 }  private static void validate(final String repositoryName; final String snapshotName) {
 if (Strings.hasLength(snapshotName) == false) {
 throw new InvalidSnapshotNameException(repositoryName; snapshotName; "cannot be empty");
 if (snapshotName.contains(" ")) {
 throw new InvalidSnapshotNameException(repositoryName; snapshotName; "must not contain whitespace");
 if (snapshotName.contains(";")) {


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