Don't use bfetch route version number

x-pack/test/common/services/search_secure.ts

@@ -12,7 +12,6 @@ import expect from '@kbn/expect';
 import request from 'superagent';
 import type { IEsSearchResponse } from '@kbn/search-types';
 import { ELASTIC_HTTP_VERSION_HEADER } from '@kbn/core-http-common';
-import { BFETCH_ROUTE_VERSION_LATEST } from '@kbn/bfetch-plugin/common';
 import { SupertestWithoutAuthProviderType } from '@kbn/ftr-common-functional-services';
 import { FtrService } from '../ftr_provider_context';
 
@@ -113,7 +112,7 @@ export class SearchSecureService extends FtrService {
         .auth(auth.username, auth.password)
         .set('kbn-xsrf', 'true')
         .set('x-elastic-internal-origin', 'Kibana')
-        .set(ELASTIC_HTTP_VERSION_HEADER, BFETCH_ROUTE_VERSION_LATEST)
+        .set(ELASTIC_HTTP_VERSION_HEADER, '1')
         .send()
         .expect(200);
       const [parsedResponse] = parseBfetchResponse(resp);