Sametimes logs are not parsed

Using filebeat 7.10.2 and sending to ES 7.10.2 , same times are logs not parsed, with no errors, exemple of a log not parsed

{"type":"log","@timestamp":"2021-10-26T14:04:32Z","tags":["info","plugins","security","audit","alerts","alerts_authorization_success"],"pid":6,"eventType":"alerts_authorization_success","username":"e49608","alertTypeId":"monitoring_alert_logstash_version_mismatch","scopeType":0,"scope":"monitoring","operation":"get","message":"e49608 Authorized to get a "monitoring_alert_logstash_version_mismatch" alert for "monitoring""}

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How do you know they are not parsed?