[Snyk] Security upgrade org.apache.solr:solr-solrj from 8.11.1 to 9.0.0

[pushkala-datastax]

Snyk has created this PR to fix 1 vulnerabilities in the maven dependencies of this project.

Snyk changed the following file(s):

• pulsar-io/solr/pom.xml

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score	Upgrade
	Infinite loop SNYK-JAVA-IONETTY-18230935	721	org.apache.solr:solr-solrj: 8.11.1 -> 9.0.0 Major version upgrade No Known Exploit

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[pushkala-datastax]

This major version upgrade from Solr 8.x to 9.0.0 introduces significant breaking changes that require developer action. The upgrade involves a mandatory Java version bump, critical changes to the SolrJ client libraries, and the removal of major server-side features.

Key Breaking Changes:

• Java 11 Requirement: Solr 9.0.0 requires a minimum Java version of 11 to run. Any application using the solr-solrj client must be running in a Java 11 or later environment.
• CloudSolrClient Refactoring: The primary client for SolrCloud, CloudSolrClient, has been significantly changed. It now supports HTTP/2 and uses a new Builder for instantiation. The previous client implementation has been renamed to CloudLegacySolrClient and is now deprecated. Code that creates CloudSolrClient instances will break and must be updated.
• New ZooKeeper Dependency: ZooKeeper-related dependencies have been extracted from the main solr-solrj artifact into a new solr-solrj-zookeeper module. Applications using CloudSolrClient must now explicitly add this new dependency to their build.
• Client Deprecations: HttpSolrClient and LBHttpSolrClient are now deprecated due to their lack of HTTP/2 support.
• Removed Server-Side Features: Several major features have been completely removed from the Solr server, and any client code interacting with them will fail. This includes the Data Import Handler (DIH), the autoscaling framework, and Cross-Data Center Replication (CDCR).

Recommendation:
This is a high-impact upgrade. Developers must:

1. Ensure the application environment is updated to Java 11 or newer.
2. Update CloudSolrClient instantiation to use the new builder pattern.
3. Add the org.apache.solr:solr-solrj-zookeeper dependency if using SolrCloud.
4. Review code for any interaction with removed features like DIH or autoscaling APIs and refactor accordingly.

Source: Apache Solr 9.0 Release Notes, Solr 9 Upgrade Guide

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