Fix date timestamps | New Troubleshooting Page

[stefnestor]

Summary

👋 howdy, team! This generalizes a top Support article Detect, prevent, and clean-up future dates (@timestamp) into a general new troubleshooting guide on how to detect, cleanup, and avoid-impact-from timestamp data quality issues.

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🔍 Preview links for changed docs

• troubleshoot/elasticsearch.md
• troubleshoot/elasticsearch/fix-date-timestamps.md

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