avoid calculating hash of all index pattern properties (elastic#184292)

src/plugins/kibana_utils/common/calculate_object_hash.test.ts

@@ -0,0 +1,24 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import { calculateObjectHash } from './calculate_object_hash';
+
+describe('calculateObjectHash', () => {
+  test('calculates hash of the object', () => {
+    const object = { test: 123 };
+
+    expect(calculateObjectHash(object)).toEqual('5094c3dc');
+  });
+
+  test('ignore inner props of index object expect for the value.id', () => {
+    const object1 = { test: 123, index: { value: { id: 'test', otherprop: 1 } } };
+    const object2 = { test: 123, index: { value: { id: 'test', otherprop: 2 } } };
+
+    expect(calculateObjectHash(object1)).toEqual(calculateObjectHash(object2));
+  });
+});

src/plugins/kibana_utils/common/calculate_object_hash.ts

@@ -53,6 +53,9 @@ function foldValue(input: number, value: any, key: string, seen: any[]) {
     if (key === 'vis' && value.constructor.name === 'Vis') {
       return hash;
     }
+    if (key === 'index' && value.value?.id) {
+      return fold(hash, value.value.id);
+    }
     if (seen.indexOf(value) !== -1) {
       return fold(hash, '[Circular]' + key);
     }