Cleanup some imports

src/plugins/discover/public/application/components/sidebar/discover_field_search.test.tsx

@@ -16,7 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-import React, { EventHandler, MouseEvent as ReactMouseEvent } from 'react';
+import React from 'react';
 import { act } from 'react-dom/test-utils';
 import { mountWithIntl } from '@kbn/test/jest';
 import { findTestSubject } from '@elastic/eui/lib/test';