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  • The Lucene version used by Solr has been upgraded to 9.8.
  • Added support for node-level caches

  • Circuit Breakers available for Update Requests

  • A new Circuit breaker for percentage of CPU utilization is added. The former "CPU" circuit breaker is now more correctly named LoadAverageCircuitBreaker as it trips on system load average which is not a percentage.

  • A new Always-On trace id generator and the rid parameter is being deprecatedSolr now includes an always-on trace id generator. This will inject trace id headers for every Solr request, propagating the client supplied value or generating a new id as needed and replaces the existing `rid` mechanism.

  • Expensive core operations run on a dedicated thread pool - Backupbackup, Restore restore and Split split are expensive operations

  • Added support of OAuth 2.0/OIDC 'code with PKCE' flow

  • Multiple bug fixes for TLS and mTLS

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