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.
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) {
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