Unknown strategy strategyName – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an unrecognized or unsupported strategy name in its configuration or query. This could be due to a typo, incorrect syntax, or usage of a strategy that is not available in the current version of Elasticsearch. To resolve this issue, you should first verify the strategy name for any spelling or syntax errors. If the name is correct, check the Elasticsearch documentation to ensure the strategy is supported in your version. If it’s not supported, consider upgrading Elasticsearch or using a different, supported strategy.

This guide will help you check for common problems that cause the log ” Unknown strategy [” + strategyName + ” ] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: query, index.

Log Context

Log “Unknown strategy [” + strategyName + ” ]” class name is GeoShapeQueryBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 return true;
 } else if (STRATEGY_FIELD.match(parser.currentName(); parser.getDeprecationHandler())) {
 String strategyName = parser.text();
 strategy = SpatialStrategy.fromString(strategyName);
 if (strategy == null) {
 throw new ParsingException(parser.getTokenLocation(); "Unknown strategy [" + strategyName + " ]");
 } else {
 this.strategy = strategy;
 return true;