Splunk Enterprise Security 5.1 is compatible with Splunk 7.1.
Per the docs: Splunk Web for Splunk 7.1.0 and Splunk Enterprise Security 5.1.0 provides an updated look and feel. As a result, these two releases of the Splunk platform and Splunk Enterprise Security are only supported with each other.
http://docs.splunk.com/Documentation/ES/5.1.0/RN/Enhancements
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