By default, Search Services is provided with cross-language search support disabled. This default configuration affects all the deployment artifacts, i.e. using a zip file or Docker image.
If you use several languages across your organization, you must enable cross-language search support in all text fields. To do this update the alfresco-search-services/solrhome/conf/shared.properties configuration file:
alfresco.cross.locale.datatype.0={http://www.alfresco.org/model/dictionary/1.0}text
alfresco.cross.locale.datatype.1={http://www.alfresco.org/model/dictionary/1.0}content
alfresco.cross.locale.datatype.2={http://www.alfresco.org/model/dictionary/1.0}mltext
Note: A reindex of Search Services is required after applying the
configuration.