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The changes listed below have been released for the first time in Elasticsearch 8.0.0-alpha1.
- Disallow specifying the same percentile multiple times in percentiles aggregation #52257
- Dynamic mappings in indices created on 8.0 and later have stricter validation at mapping update time. (e.g. incorrect analyzer settings or unknown field types). #51233
- Remove undocumented endpoints of hot threads API #55109
Coming in 8.0.0.