When fulltext indexing is disabled in the repository, it's not possible to query for CMIS repositories info:
Caused by: java.lang.NullPointerException at org.nuxeo.ecm.core.opencmis.impl.server.NuxeoRepository.<init>(NuxeoRepository.java:181) ~[nuxeo-opencmis-impl-11.2.11.jar:?] at org.nuxeo.ecm.core.opencmis.impl.server.NuxeoRepositories.initRepositories(NuxeoRepositories.java:70) ~[nuxeo-opencmis-impl-11.2.11.jar:?] at org.nuxeo.ecm.core.opencmis.impl.server.NuxeoRepositories.getRepositories(NuxeoRepositories.java:58) ~[nuxeo-opencmis-impl-11.2.11.jar:?] at org.nuxeo.ecm.core.opencmis.impl.server.NuxeoCmisService.getRepositoryInfos(NuxeoCmisService.java:399) ~[nuxeo-opencmis-impl-11.2.11.jar:?] at org.apache.chemistry.opencmis.server.support.wrapper.ConformanceCmisServiceWrapper.getRepositoryInfos(ConformanceCmisServiceWrapper.java:553) ~[chemistry-opencmis-server-support-1.1.0.jar:1.1.0]