JIRA Agile plugin of jboss.org JIRA has been updated to latest version 6.7.6.
Search by the Sprint field for JIRA's basic search had been introduced in JIRA Agile 6.7.2. In this release, the Epic Link and Epic Name fields has been added as parameters for the basic search. Just navigate to the basic search, click More and add the Epic Link and/or Epic Name field.
Release contains few bugfixes also. For more details see Release notes https://confluence.atlassian.com/display/AGILE/JIRA+Agile+6.7.6+Release+Notes