Zookeemer ensembles absolutely must be secured by IP Filtering. Otherwise, they are vulnerable to hacking. The SearchStax Managed Search service enforces this requirement. See How can I secure Zookeeper?
Solr nodes and clusters should be secured with IP Filtering and Solr Basic Auth. There are applications where Solr must respond to unpredictable IPs, however, so SearchStax does not enforce IP Filtering on Solr nodes as long as Basic Auth is in place.
For deployments in Virtual Private Clouds, our engineers configure the IP filters on your behalf.
Questions?
Do not hesitate to contact the SearchStax Support Desk.