Version string expected min version – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.6-7.9

Briefly, this error occurs when Elasticsearch expects a version string for the [min_version] parameter, but it’s not provided or is in an incorrect format. This usually happens during operations like index creation or upgrade. To resolve this, ensure that the [min_version] parameter is correctly specified in the request. It should be a string representing the minimum version of Elasticsearch required for the operation. Also, check for any syntax errors or typos in your request.

This guide will help you check for common problems that cause the log ” version string expected [min_version] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repositories, version.

Log Context

Log “version string expected [min_version]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 throw new ElasticsearchParseException("start object expected [" + INDEX_METADATA_IDENTIFIERS + "]");
 } else if (MIN_VERSION.equals(field)) {
 if (parser.nextToken() != XContentParser.Token.VALUE_STRING) {
 throw new ElasticsearchParseException("version string expected [min_version]");
 final Version version = Version.fromString(parser.text());
 assert SnapshotsService.useShardGenerations(version);
 } else {
 throw new ElasticsearchParseException("unknown field name  [" + field + "]");