The Metricbeat AWS Billing module sets the field EstimatedCharges as a Long. The AWS Billing Integration data stream for the agent sets EstimatedCharges.max as a Long. User reported an error with the AWS agent integration https://elasticstack.slack.com/archives/CNTP6NLTZ/p1631079578142800?thread_ts=1631079307.142600&cid=CNTP6NLTZ.

(status=400): {"type":"mapper_parsing_exception","reason":"object mapping for [aws.billing.EstimatedCharges] tried to parse field [EstimatedCharges] as object, but found a concrete value"}

The change in the Metricbeat module from EstimatedCharges.max to EstimatedCharges was made in elastic/beats#20527
The AWS Integration needs to update its field mapping to match the Metricbeat module.