Merge "update format in kythe latest.txt"
diff --git a/linux-x86_64/kythe/studio/build_studio_kythe.sh b/linux-x86_64/kythe/studio/build_studio_kythe.sh
index 1d3e662..39b2785 100755
--- a/linux-x86_64/kythe/studio/build_studio_kythe.sh
+++ b/linux-x86_64/kythe/studio/build_studio_kythe.sh
@@ -59,7 +59,7 @@
   TIMESTAMP=$(date +'%s')
   "${GSUTIL}" -m cp "${OUT_ENTRIES}/*" "${GSBUCKET}/${TIMESTAMP}/"
   LATEST_FILE="$(mktemp)"
-  echo ${TIMESTAMP}>"${LATEST_FILE}"
+  echo "str_var <name:'kythe_index_version' value:'${TIMESTAMP}'>">"${LATEST_FILE}"
   "${GSUTIL}" cp "${LATEST_FILE}" "${GSBUCKET}/latest.txt"
   rm "${LATEST_FILE}"
 fi
\ No newline at end of file