sortable.showIndexesBoolean(default: true)
If set to true the user will see sort sequence indicators for sorted columns.
Example - do not allow unsorting
<div id="grid"></div>
<script>
$("#grid").kendoGrid({
  columns: [
    { field: "name" },
    { field: "age" }
  ],
  dataSource: [
    { name: "Jane Doe", age: 30 },
    { name: "John Doe", age: 33 }
  ],
  sortable: {
    showIndexes: true,
    mode: "multiple"
  }
});
</script>
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