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Specify a value for the "varStatus" attribute:
<ui:repeat id="..." var="..." value="..." varStatus="myVarStatus">
You can then access the loop index via EL:
#{myVarStatus.index}
Additionally, the following properties are available to the varStatus:
For more details, see:
https://docs.oracle.com/javaee/7/javaserver-faces-2-2/vdldocs-facelets/ui/repeat.html