Add basic link from discover to the context app

The doc viewer panel now contains a (hideous) link which displays the
context of the entry using the same column configuration. The location
and styling is hopefully subject to future improvement

src/ui/public/doc_table/components/table_row.js

@@ -1,5 +1,6 @@
 import _ from 'lodash';
 import $ from 'jquery';
+import rison from 'rison-node';
 import 'ui/highlight';
 import 'ui/highlight/highlight_tags';
 import 'ui/doc_viewer';
@@ -24,7 +25,7 @@ let MIN_LINE_LENGTH = 20;
  * <tr ng-repeat="row in rows" kbn-table-row="row"></tr>
  * ```
  */
-module.directive('kbnTableRow', function ($compile) {
+module.directive('kbnTableRow', function ($compile, $httpParamSerializer) {
   let cellTemplate = _.template(noWhiteSpace(require('ui/doc_table/components/table_row/cell.html')));
   let truncateByHeightTemplate = _.template(noWhiteSpace(require('ui/partials/truncate_by_height.html')));
 
@@ -87,6 +88,16 @@ module.directive('kbnTableRow', function ($compile) {
         createSummaryRow($scope.row, $scope.row._id);
       });
 
+      $scope.getContextAppHref = () => {
+        return `#/context/${$scope.indexPattern.id}/${$scope.row._type}/${$scope.row._id}?${
+          $httpParamSerializer({
+            _a: rison.encode({
+              columns: $scope.columns,
+            }),
+          })
+        }`;
+      };
+
       // create a tr element that lists the value for each *column*
       function createSummaryRow(row) {
         let indexPattern = $scope.indexPattern;

src/ui/public/doc_table/components/table_row/details.html

@@ -2,5 +2,8 @@
   <a class="pull-right" ng-href="#/doc/{{indexPattern.id}}/{{row._index}}/{{row._type}}/?id={{row._id | uriescape}}">
     <small>Link to /{{row._index}}/{{row._type}}/{{row._id | uriescape}}</small></i>
   </a>
+  <a class="pull-right" ng-href="{{ getContextAppHref() }}">
+    <small>View surrounding entries</small></i>
+  </a>
   <doc-viewer hit="row" filter="filter" columns="columns" index-pattern="indexPattern"></doc-viewer>
-</td>
+</td>