Solr compatibility table

These tables present the compatibility of different Sitecore CMS/XP versions with different Solr versions.

Solr	XP 9.0	XP 9.1	XP 9.2	XP 9.3	XP 10.0
6.6.1 [6]	✓[4]	–	–	–	–
6.6.2 – 6.6.5 [6]	✓	–	–	–	–
6.6.6	*	–	–	–	–
7.2.1 [7]	–	✓	–	–	–
7.5 [7]	–	–	✓	–	–
8.1.1 [7]	–	–	–	✓	–
8.4	–	–	–	–	✓

Solr	CMS 7.0 – XP 8.0	XP 8.1	XP 8.2
4.1	✓	*	*
4.2 – 4.7	*	*	*
4.8 – 4.9	*[1]	*	*
4.10	*[1]	✓	*
5.0[6]	*[1]	*	*
5.1[6]	*[1]	*	✓
5.2 – 5.4[6]	*[1]	*	*
5.5[6]	–[3]	–[3]	–[3]
5.5.1, 6.0 – 6.1[6]	*[1][2]	*[2]	*[2]
6.6.1[6]	–	–	✓[4][5]
6.6.2 – 6.6.5[6]	–	–	✓[5]
6.6.6	–	–	*[5]

Legend:

✓	officially tested, recommended
*	not officially tested, but expected to work
–	no compatibility information or does not work

This table presents the support status of the SolrCloud feature for different Sitecore CMS/XP versions:

	CMS 7.0 – XP 8.1	XP 8.2 – XP 9.0 Update-1	XP 9.0 Update-2 and later
Support status	Not supported	Under Experimental Support	Officially tested and supported

For information about Experimental Support, read the Sitecore Product Support Lifecycle article. The Solr Index replication feature is not supported. The SolrCloud feature can be used as a replacement.

[1] Changes in the default schema.xml file shipped with Solr 4.8 and later can cause the following issues:

Sitecore cannot be initialized due to the following error:

[NullReferenceException: Object reference not set to an instance of an object.]
   SolrNet.Schema.SolrSchemaParser.Parse(XDocument solrSchemaXml)
   SolrNet.Impl.SolrBasicServer`1.GetSchema()
   Sitecore.ContentSearch.SolrProvider.SolrSearchIndex.Initialize()
   Sitecore.ContentSearch.SolrProvider.SolrContentSearchManager.Initialize()
   Sitecore.ContentSearch.SolrProvider.CastleWindsorIntegration.WindsorSolrStartUp.Initialize()

The Build Solr Schema wizard successfully completes building the schema, but the resulting schema.xml file lacks a Sitecore-specific configuration.

To resolve the issue, apply the corresponding solution 1 described in the following Solution section.

[2] Starting from Solr 6, the default Config Sets are distributed without the schema.xml file.

To resolve the issue, apply the corresponding solution 2 described in the following Solution section.

[3] Known issues for Solr 5.5 (https://issues.apache.org/jira/browse/SOLR-8793) result in the following Sitecore error:

WARN  Unable to connect to Solr: [http://{hostname}:{port}/solr], the [SolrNet.Exceptions.SolrConnectionException] was caught.
Exception: SolrNet.Exceptions.SolrConnectionException
Message: Error handling 'status' action
org.apache.solr.common.SolrException: Error handling 'status' action

To resolve the issue, upgrade Solr to 5.5.1 or a later version.

[4] Solr server can try to initialize a Solr core twice, resulting in the following error:
```
org.apache.solr.common.SolrException: Unable to create core [core_name]
...
Caused by: org.apache.lucene.store.LockObtainFailedException: Lock held by this virtual machine: C:\solr-6.6.1\server\solr\core_name\data\index\write.lock
```
The error is caused by a Solr bug: SOLR-11297

The issue does not affect Sitecore functionality and you can ignore it. To resolve the issue, upgrade Solr to 6.6.2.
[5] For Sitecore XP 8.2 Update-6 (rev. 171121) and 8.2 Update-7 (rev. 180406).
[6] Solr versions 5.0–5.5.5, 6.0–6.6.5 are affected by a security vulnerability CVE-2019-0192 (SOLR-13301). Available solutions are:

Upgrade to Sitecore XP 9.1 and use Apache Solr 7.2.1.
Disable the Config API by running Solr with the system property disable.configEdit=true.
Upgrade to Solr 6.6.6
If upgrading or disabling the Config API are not viable options, apply SOLR-13301.patch and re-compile Solr.
Ensure your network settings are configured so that only trusted traffic is allowed to ingress/egress your hosts running Solr.

[7] Index-time boosts are not supported starting from Solr 7.0. If any boosts are provided, they will be ignored by the indexing chain. For more details please see the corresponding task LUCENE-6819 in the Lucene/Solr bug tracker and Solr 7.0 release notes.

Note: If both solutions apply to your specific SXP and Solr version combination, you must implement Solution [2] before Solution [1].

To resolve the issue:

Make the following changes in the default schema.xml file distributed with Solr:
- Enclose all <field> and <dynamicField> elements in the <fields> tag.
- Enclose all <fieldType> elements in the <types> tag.
To add Sitecore-specific configuration, pass the modified schema.xml file to the Build Solr Schema wizard.
Put the resulting file in the configuration folder of the Solr core.
Find the following dynamic field definition in the schema.xml file:

<dynamicField name="*_pi" type="pint" indexed="true" stored="true" />

<dynamicField name="*_pi" type="tint" indexed="true" stored="true" />

Reload the core to apply the schema changes.
Restart the application pool of the website to initialize Sitecore indexes using the updated schema.xml file.

To resolve the issue:

Create a schema.xml file by duplicating and renaming the managed-schema file.
Switch to the ClassicIndexSchemaFactory setting by adding the following line to the SolrConfig.xml file:

<schemaFactory class="ClassicIndexSchemaFactory" />

If the SolrConfig.xml file contains the following UpdateRequestProcessorChain
```
<updateRequestProcessorChain name="add-unknown-fields-to-the-schema">
```
then find and comment out its AddSchemaFieldsUpdateProcessorFactory processor.

Description

Notes

Solution [1]

Solution [2]