The Solr UI admin core status never shows as current when using RT indexing
The core status will not be indexing but the status will never be current as per this example:
When using RT indexing this status is never set to current
The following internal jira was raised to track this issue:
DSP-9838 - DSE Solr core status never shows "current" when using RT indexing
Check the logs / core status, if the core is not indexing then it could be safe to assume the core is current. See the docs:
At the time of writing this note, this issue is still outstanding.