Hello,
I upgraded the version with 8.1.1 The issue is in KtDataTable. I created the header array like below.
const tableHeader = ref([
 {
 columnName: "#Sr",
 columnLabel: "index",
 sortEnabled: true,
 columnWidth: 20,
 },
 {
 columnName: "Customer Name",
 columnLabel: "first_name",
 sortEnabled: true,
 columnWidth: 230,
 },
 ]);KtDataTable component using columnLabel.columnLabel instead of columnNamefrontend/src/components/kt-datatable/table-partials/table-content/table-head/TableHeadRow.vue
<template v-for="(column, i) in header" :key="i">
 <th
 :class="{
 'text-end': i === header.length - 1,
 }"
 @click="onSort(column.columnLabel, column.sortEnabled)"
 :style="{
 minWidth: column.columnWidth ? `${column.columnWidth}px` : '0',
 width: 'auto',
 cursor: column.sortEnabled ? 'pointer' : 'auto',
 }"
 >
 {{ column.columnLabel }}
 <span
 v-if="
 columnLabelAndOrder.label === column.columnLabel &&
 column.sortEnabled
 "
 v-html="sortArrow"
 ></span>
 </th>
 </template>
Hi,
Thank you for your feedback.
It is mistaken, you can change {{ column.columnLabel }} to {{ column.columnName }} in file src/components/kt-datatable/table-partials/table-content/table-head/TableHeadRow.vue, we will include fix to next releease Metronic release.
One more issue I am facing is. if I want to add row index to my table what I to do is there any provision for that?
You can add row index in the same way as other columns, just a add new id column configuration object.
{
 columnName: "Id",
 columnLabel: "id",
 sortEnabled: true,
 columnWidth: 20,
 },Hi, the above one is not working, it added my id value which comes from the API. I want to use a custom index for each row.
<template v-slot:>
 {{ data.id }} //This is trhe id which I get from the API
 </template>{
 columnName: "Id",
 columnLabel: "id",
 sortEnabled: true,
 columnWidth: 20,
},You need to specify the template differently using your id slot.
Instead of v-slot: use v-slot:id ="{ row: customer }".
In the case you mentioned above it's working fine, like it's print the id of my object key.
For example - Element Ui table provide the 
type="index"Hi,
Unfortunately, this is not handled by our component at the moment. We will consider including this in upcoming releases.
Is this any customization so I can implement in the KTdatatable component. It would be great if you provide me with the solution for that. 
Because in every module I am using the KTDataTable and I need to be show that index
Hi,
You can add new cell in file src/components/kt-datatable/table-partials/table-content/table-body/TableBodyRow.vue.
Before the data display array place a new cell code.
<td>
 {{ i }}
</td>