Could not parse transform for watch unknown transform type – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch tries to parse a transform for a watch but encounters an unknown transform type. This usually happens when the transform type specified in the watch definition is not recognized by Elasticsearch. To resolve this issue, you can check the watch definition and ensure that the transform type is correctly spelled and supported by your version of Elasticsearch. If the transform type is a custom one, make sure it has been properly registered. Also, ensure that the watch definition is correctly formatted and doesn’t contain any syntax errors.

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This guide will help you check for common problems that cause the log ” could not parse transform for watch [{}]; unknown transform type [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “could not parse transform for watch [{}]; unknown transform type [{}]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 throws IOException {
 TransformFactory> factory = factories.get(
 if (factory == null) {
 throw new ElasticsearchParseException("could not parse transform for watch [{}]; unknown transform type [{}]"; watchId; type);
 return factory.parseExecutable(watchId; parser);
 }  public Transform parseTransform(String watchId; String type; XContentParser parser) throws IOException {


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