Revert "Make searching saved objects more powerful with query_string (#9870)" (#10239)

This reverts commit 64a03fafd4.
- We should discuss how to solve this within the UI layer first.

src/core_plugins/kibana/public/management/sections/objects/_objects.js

@@ -37,7 +37,6 @@ uiModules.get('apps/management')
       const getData = function (filter) {
         const services = registry.all().map(function (obj) {
           const service = $injector.get(obj.service);
-
           return service.find(filter).then(function (data) {
             return {
               service: service,

src/ui/public/courier/saved_object/saved_object_loader.js

@@ -78,12 +78,11 @@ export class SavedObjectLoader {
    */
   find(searchString, size = 100) {
     let body;
-
     if (searchString) {
       body = {
         query: {
-          query_string: {
-            query: /^\w+$/.test(searchString) ? `${searchString}*` : searchString,
+          simple_query_string: {
+            query: searchString + '*',
             fields: ['title^3', 'description'],
             default_operator: 'AND'
           }
@@ -99,19 +98,6 @@ export class SavedObjectLoader {
       body,
       size
     })
-      .catch(err => {
-        // attempt to mimic simple_query_string, swallow formatting error
-        if (err.statusCode === 400) {
-          return {
-            hits: {
-              total: 0,
-              hits: [],
-            }
-          };
-        }
-
-        throw err;
-      })
       .then((resp) => {
         return {
           total: resp.hits.total,