Update DocViewerTab if columns is changed

Signed-off-by: Tony Lee <[email protected]>

src/plugins/discover/public/application/components/doc_viewer/doc_viewer_tab.tsx

@@ -65,6 +65,7 @@ export class DocViewerTab extends React.Component<Props, State> {
   shouldComponentUpdate(nextProps: Props, nextState: State) {
     return (
       nextProps.renderProps.hit._id !== this.props.renderProps.hit._id ||
+      nextProps.renderProps.columns !== this.props.renderProps.columns ||
       nextProps.id !== this.props.id ||
       nextState.hasError
     );