Solr 10: Add new config-set templates for Solr 10

After copying over the 9.x templates, the LUCENE_90 value in solrconfig.xml needs to be adapted. According to lucene TestVersion.java it looks like the correct value is LUCENE_10_0.

PR: https://github.com/mkalkbrenner/search_api_solr/pull/116

Up until Solr 9, it was necessary to use the -c or --cloud flag to start solr in cloud mode. In Solr 10 this is now the default.

• Control script reference Solr 9
• Control script reference Solr 10

The bin/post script has been replaced with the bin/solr post command.

• Post Tool

The deprecated solrcore.properties configuration method has been removed. The ability to configure a core via a custom properties file using the core.proprties properties setting remains.

• Core Discovery

Very funny problem due to the size of the XML configuration:

[solr10] | 2026-03-06 13:38:20.332 ERROR (qtp324404955-35-null-46) [ t:null-46] o.a.s.h.RequestHandlerBase Client exception =>org.apache.solr.common.SolrException: Error CREATEing SolrCore 'drupal_shard1_replica_n1': Unable to create core [drupal_shard1_replica_n1] Caused by: JAXP00010004: The accumulated size of entities is "100,001" that exceeded the "100,000" limit set by "jdk.xml.totalEntitySizeLimit".

This is because solr 10 docker image is based on a newer JDK image. And they thightened the limits in between.

• ExternalFileField field type has been removed.

The alternative dutch stemmer which was selected using the language="Kp" attribute is now the default stemming implementation.

• remove unsupported snowball algorithms#13230
• MIGRATE.md#snowball-dependency-upgrade-dutch-stemmer

The legacy Circuit Breaker named CircuitBreakerManager is removed.

I'm unable to get the github actions to work. It seems that docker compose up -d in jump-start/solr10 is failing to create the drupal collection. However, I cannot reproduce that locally. It always succeeds on my machine.

But the most important thing that is starnge is that the jump-start tests should have failed because there are no Solr 10.x templates.

The solr templates are there, and also the changes in SolrConfigSetController.php and SolrConnectorPluginBase.php. But it looks like gitlab doesn't manage to render it...

% git log --decorate --oneline | head -n1
ab30af81 (HEAD -> 3577485-solr-10-add, search_api_solr-3577485/3577485-solr-10-add) No need to translate 10.x

% git diff --stat=127 4.x |grep -v jump-start
 .gitlab-ci.yml                                                      |    32 +-
 config/optional/search_api_solr.solr_field_type.text_nl_10_0_0.yml  | 45924 +++++++++++++++++++++++++++++++++++++++++++++++++
 solr-conf-templates/10.x/core.properties                            |     1 +
 solr-conf-templates/10.x/elevate.xml                                |    27 +
 solr-conf-templates/10.x/schema.xml                                 |   475 +
 solr-conf-templates/10.x/solrconfig.xml                             |   805 +
 solr-conf-templates/10.x/solrcore.properties                        |    17 +
 src/Controller/SolrConfigSetController.php                          |     3 +-
 src/SolrConnector/SolrConnectorPluginBase.php                       |    29 +-
 tests/src/Kernel/SearchApiSolrExtractionTest.php                    |     1 +
 378 files changed, 234288 insertions(+), 13 deletions(-)

Guess the problem is this:

I've added a draft merge request without the changes in jump-start.

Running this in pre-production. There are no stats due to removal of mbean handler, but other than that things look good.