Briefly, this error occurs when Elasticsearch is unable to parse the transform for a watch because it expects an array of transform objects, but it’s not receiving that. This could be due to incorrect formatting or syntax in the transform section of the watch. To resolve this issue, you should review and correct the syntax of your watch definition. Ensure that the transform section is properly formatted as an array of objects. Also, validate your JSON structure to ensure there are no errors.
This guide will help you check for common problems that cause the log ” could not parse [{}] transform for watch [{}]. expected an array of transform objects; ” 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 [{}]. expected an array of transform objects;” class name is ChainTransform.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
} static ChainTransform parse(String watchId; XContentParser parser; TransformRegistry transformRegistry) throws IOException {
XContentParser.Token token = parser.currentToken();
if (token != XContentParser.Token.START_ARRAY) {
throw new ElasticsearchParseException("could not parse [{}] transform for watch [{}]. expected an array of transform objects;" +
" but found [{}] instead"; TYPE; watchId; token);
} List transforms = new ArrayList<>();
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