[proofpoint_tap] Add error.message ECS field mapping

[taylor-swanson]

Proposed commit message

• Add the error.message field to the ECS mappings
• When not explicitly mapped in ecs.yml, error.message will assume a default type of keyword which conflicts with the ECS-defined type of match_only_text.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

[elasticmachine]

🚀 Benchmarks report

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[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[efd6]

LGTM. Can you add background of the issue in the commit message for external readers.

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 6cae143

History

• 💚 Build #8289 succeeded f6813ae

cc @taylor-swanson

[elasticmachine]

Package proofpoint_tap - 1.16.2 containing this change is available at https://epr.elastic.co/search?package=proofpoint_tap