Using both TL2013 and the current standalone beta (2014-03-16) I see a
spurious comma in index entries referring to endnote locations. The
following MWE shows the problem:
\setupnote[footnote][location=none]
\starttext
Index in endnote.\footnote{\index{Why a comma?}Endnote.}
\placefootnotes
\placeindex
\stoptext
--
Rik
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