[ML] Delayed data annotation - repeated audit messages

[pheyos]

Found in version

• 7.0.0 b3838

Steps to reproduce
For easy reference, let's name consecutive buckets bucket 1, bucket 2, ... (in the example screenshot bucket 1 is 10:30 - 10:45, bucket 2 is 10:45 - 11:00, bucket 3 is 11:00 - 11:15, ...)

• In a real time job add 1 document to the already processed bucket 1
• Wait until bucket 1, bucket 2 and bucket 3 are processed
• Add 2 documents to bucket 3
• Wait until the delayed data check for bucket 3 is done
• Look at the job audit messages

Expected result

• There is one audit message about 1 missing document in bucket 1
• There is one audit message about 2 missing documents in bucket 3

Actual result

• ✔️ There is one audit message about 1 missing document in bucket 1
• ❌ There are three audit messages about 3 missing documents in bucket3:

[elasticmachine]

Pinging @elastic/ml-core