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Briefly, this error occurs when Elasticsearch is unable to parse the trigger event for a watch due to an unexpected trigger type. This usually happens when the trigger type is not a string as expected. To resolve this issue, you should check the watch definition and ensure that the trigger type is correctly defined as a string. If the error persists, you may need to debug the watch to identify any underlying issues. Also, ensure that your Elasticsearch version supports the trigger type you’re using.
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This guide will help you check for common problems that cause the log ” could not parse trigger event for [{}] for watch [{}]. expected trigger type string ” 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 trigger event for [{}] for watch [{}]. expected trigger type string” class name is TriggerService.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
public TriggerEvent parseTriggerEvent(String watchId; String context; XContentParser parser) throws IOException {
XContentParser.Token token = parser.currentToken();
assert token == XContentParser.Token.START_OBJECT;
token = parser.nextToken();
if (token != XContentParser.Token.FIELD_NAME) {
throw new ElasticsearchParseException("could not parse trigger event for [{}] for watch [{}]. expected trigger type string " +
"field; but found [{}]"; context; watchId; token);
}
String type = parser.currentName();
token = parser.nextToken();
if (token != XContentParser.Token.START_OBJECT) {
