[indexPattern] added _score as a default meta field

src/kibana/components/config/defaults.js

@@ -39,7 +39,7 @@ define(function () {
         description: 'The index to access if no index is set',
       },
       'metaFields': {
-        value: ['_source', '_id', '_type', '_index'],
+        value: ['_source', '_id', '_type', '_index', '_score'],
         description: 'Fields that exist outside of _source to merge into our document when displaying it',
       },
       'discover:sampleSize': {

src/kibana/components/doc_table/doc_table.less

@@ -23,4 +23,4 @@ doc-table {
     z-index: 20;
     opacity: @loading-opacity;
   }
-}
+}

src/kibana/components/index_patterns/_cast_mapping_type.js

@@ -31,10 +31,10 @@ define(function (require) {
      * @return {String} - the most specific type that we care for
      */
     function castMappingType(name) {
-      var match = castMappingType.types.byName[name];
+      if (!name) return 'unknown';
 
-      if (match) return match.type;
-      return 'string';
+      var match = castMappingType.types.byName[name];
+      return match ? match.type : 'string';
     }
 
     return castMappingType;

src/kibana/components/index_patterns/_field.js

@@ -38,8 +38,7 @@ define(function (require) {
 
       var indexed = !!spec.indexed;
       var scripted = !!spec.scripted;
-
-      var sortable = (indexed || scripted) && type.sortable;
+      var sortable = spec.name === '_score' || ((indexed || scripted) && type.sortable);
       var bucketable = indexed || scripted;
       var filterable = spec.name === '_id' || scripted || (indexed && type.filterable);
 

src/kibana/components/index_patterns/_map_field.js

@@ -18,14 +18,18 @@ define(function (require) {
 
       // Override the mapping, even if elasticsearch says otherwise
       var mappingOverrides = {
-        _timestamp: {
-          indexed: true,
-          type: 'date'
-        },
         _source: { type: '_source' },
         _index: { type: 'string' },
         _type: { type: 'string' },
-        _id: { type: 'string' }
+        _id: { type: 'string' },
+        _timestamp: {
+          type: 'date',
+          indexed: true
+        },
+        _score: {
+          type: 'number',
+          indexed: false
+        }
       };
 
       if (!mapping.index || mapping.index === 'no') {

src/kibana/components/index_patterns/_transform_mapping_into_fields.js

@@ -36,6 +36,14 @@ define(function (require) {
         });
       });
 
+      config.get('metaFields').forEach(function (meta) {
+        if (fields[meta]) return;
+
+        var field = { mapping: {} };
+        field.mapping[meta] = {};
+        fields[meta] = mapField(field, meta);
+      });
+
       return _.map(fields, function (mapping, name) {
         mapping.name = name;
         return mapping;

src/kibana/plugins/discover/controllers/discover.js

@@ -331,7 +331,6 @@ define(function (require) {
       }
 
       $scope.updateTime();
-
       segmented.setDirection(sortBy === 'time' ? (sort[1] || 'desc') : 'desc');
       segmented.setSize(sortBy === 'time' ? $scope.opts.sampleSize : false);