feat(elasticsearch): removed dashboard import migration

public/app/plugins/datasource/elasticsearch/datasource.js

@@ -283,42 +283,6 @@ function (angular, _, moment, kbn, ElasticQueryBuilder, IndexPattern, ElasticRes
         return this.getTerms(query);
       }
     };
-
-    this.getDashboard = function(id) {
-      return this._get('/dashboard/' + id)
-      .then(function(result) {
-        return angular.fromJson(result._source.dashboard);
-      });
-    };
-
-    this.searchDashboards = function() {
-      var query = {
-        query: { query_string: { query: '*' } },
-        size: 10000,
-        sort: ["_uid"],
-      };
-
-      return this._post(this.index + '/dashboard/_search', query)
-      .then(function(results) {
-        if(_.isUndefined(results.hits)) {
-          return { dashboards: [], tags: [] };
-        }
-
-        var resultsHits = results.hits.hits;
-        var displayHits = { dashboards: [] };
-
-        for (var i = 0, len = resultsHits.length; i < len; i++) {
-          var hit = resultsHits[i];
-          displayHits.dashboards.push({
-            id: hit._id,
-            title: hit._source.title,
-            tags: hit._source.tags
-          });
-        }
-
-        return displayHits;
-      });
-    };
   }
 
   return {