Jan Kunigk and Paul Wilkinson show how to secure Solr collections:
The policy shown below establishes four Sentry roles based on the
admin,operators,users, andtechusersgroups.
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Administrators are entitled to all actions.
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Operators are granted update and query privileges.
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Users are granted query privileges.
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Tech users are granted update privileges.
These are pretty straightforward role-based access controls. The authors also look at accessing the data via Flume and a couple other technologies.