[test] Updates rollup test to allow incoming doc_count field mapper (#82547) (#82554)

* [test] Updates rollup test to allow incoming doc_count field mapper

A doc_count field mapper was added in
elastic/elasticsearch#64503

This is currently failing the ES promotion. After this promotion, we can
go back and update this test to be an exact match on the body if we
think that is the desired assertion.

Signed-off-by: Tyler Smalley <[email protected]>

Co-authored-by: Tyler Smalley <[email protected]>

Author: cjcenizal

x-pack/test/api_integration/apis/management/rollup/rollup.js

@@ -45,13 +45,21 @@ export default function ({ getService }) {
 
         const { body } = await supertest.get(uri).expect(200);
 
-        expect(body).to.eql({
-          dateFields: ['testCreatedField'],
-          keywordFields: ['testTagField'],
-          numericFields: ['testTotalField'],
-          doesMatchIndices: true,
-          doesMatchRollupIndices: false,
-        });
+        expect(Object.keys(body)).to.eql([
+          'doesMatchIndices',
+          'doesMatchRollupIndices',
+          'dateFields',
+          'numericFields',
+          'keywordFields',
+        ]);
+
+        expect(body.doesMatchIndices).to.be(true);
+        expect(body.doesMatchRollupIndices).to.be(false);
+        expect(body.dateFields).to.eql(['testCreatedField']);
+        expect(body.keywordFields).to.eql(['testTagField']);
+
+        // Allowing the test to account for future addition of doc_count
+        expect(body.numericFields.indexOf('testTotalField')).to.be.greaterThan(-1);
       });
 
       it("should not return any fields when the index pattern doesn't match any indices", async () => {