[apache.access] null deref on message field in ingest pipeline

If not mistaken appears message field is required due to first few lines shown here, even though event.original is only required for pipelines anymore
https://github.com/elastic/integrations/blob/f02f6bece99fa70aea7bb951e88a310964ee3868/packages/apache/data_stream/access/elasticsearch/ingest_pipeline/default.yml#L5-L6
`"cannot access method/field [startsWith] from a null def reference"`