update assumption that panelIndex may be missing

src/legacy/core_plugins/kibana/public/dashboard/migrations/migrate_to_730_panels.ts

@@ -20,6 +20,7 @@ import { i18n } from '@kbn/i18n';
 import semver from 'semver';
 import { GridData } from 'src/legacy/core_plugins/dashboard_embeddable_container/public/np_ready/public';
 
+import uuid from 'uuid';
 import {
   RawSavedDashboardPanelTo60,
   RawSavedDashboardPanel630,
@@ -123,16 +124,17 @@ function migratePre61PanelToLatest(
 
   const { columns, sort, row, col, size_x: sizeX, size_y: sizeY, ...rest } = panel;
 
+  const panelIndex = panel.panelIndex ? panel.panelIndex.toString() : uuid.v4();
   return {
     ...rest,
     version,
-    panelIndex: panel.panelIndex.toString(),
+    panelIndex,
     gridData: {
       x: (col - 1) * PANEL_WIDTH_SCALE_FACTOR,
       y: (row - 1) * heightScaleFactor,
       w: sizeX ? sizeX * PANEL_WIDTH_SCALE_FACTOR : DEFAULT_PANEL_WIDTH,
       h: sizeY ? sizeY * heightScaleFactor : DEFAULT_PANEL_HEIGHT,
-      i: panel.panelIndex.toString(),
+      i: panelIndex,
     },
     embeddableConfig,
   };
@@ -175,10 +177,11 @@ function migrate610PanelToLatest(
     : PANEL_HEIGHT_SCALE_FACTOR;
   const { columns, sort, ...rest } = panel;
 
+  const panelIndex = panel.panelIndex ? panel.panelIndex.toString() : uuid.v4();
   return {
     ...rest,
     version,
-    panelIndex: panel.panelIndex.toString(),
+    panelIndex,
     gridData: {
       w: panel.gridData.w * PANEL_WIDTH_SCALE_FACTOR,
       h: panel.gridData.h * heightScaleFactor,
@@ -212,10 +215,11 @@ function migrate620PanelToLatest(
     : PANEL_HEIGHT_SCALE_FACTOR;
   const { columns, sort, ...rest } = panel;
 
+  const panelIndex = panel.panelIndex ? panel.panelIndex.toString() : uuid.v4();
   return {
     ...rest,
     version,
-    panelIndex: panel.panelIndex.toString(),
+    panelIndex,
     gridData: {
       w: panel.gridData.w * PANEL_WIDTH_SCALE_FACTOR,
       h: panel.gridData.h * heightScaleFactor,
@@ -242,10 +246,11 @@ function migrate630PanelToLatest(
   }
 
   const { columns, sort, ...rest } = panel;
+  const panelIndex = panel.panelIndex ? panel.panelIndex.toString() : uuid.v4();
   return {
     ...rest,
     version,
-    panelIndex: panel.panelIndex.toString(),
+    panelIndex,
     embeddableConfig,
   };
 }
@@ -256,10 +261,11 @@ function migrate640To720PanelsToLatest(
   panel: RawSavedDashboardPanel630,
   version: string
 ): RawSavedDashboardPanel730ToLatest {
+  const panelIndex = panel.panelIndex ? panel.panelIndex.toString() : uuid.v4();
   return {
     ...panel,
     version,
-    panelIndex: panel.panelIndex.toString(),
+    panelIndex,
   };
 }
 

src/legacy/core_plugins/kibana/public/dashboard/migrations/migrations_730.test.ts

@@ -106,6 +106,38 @@ test('dashboard migration 7.3.0 migrates filters to query on search source when
   expect(newDoc.attributes.uiStateJSON).toBeUndefined();
 });
 
+// See https://github.com/elastic/kibana/issues/44639 - apparently this can happen.
+test('dashboard migration works when panelsJSON is missing panelIndex', () => {
+  const doc: DashboardDoc700To720 = {
+    id: '1',
+    type: 'dashboard',
+    references: [],
+    attributes: {
+      description: '',
+      uiStateJSON: '{}',
+      title: 'fancy stuff',
+      timeRestore: true,
+      version: 1,
+      panelsJSON:
+        '[{"id":"funky-funky","type":"visualization","size_x":7,"size_y":5,"col":1,"row":1},{"id":"funky-funky2","type":"search","size_x":5,"size_y":5,"col":8,"row":1,"columns":["_source"],"sort":["@timestamp","desc"]}]',
+      optionsJSON: '{"darkTheme":false}',
+      kibanaSavedObjectMeta: {
+        searchSourceJSON:
+          '{"filter":[{"query":{"query_string":{"query":"user:spiderman","analyze_wildcard":true}}}]}',
+      },
+    },
+  };
+
+  const doc700: DashboardDoc700To720 = migrations.dashboard['7.0.0'](doc, mockLogger);
+  const newDoc = migrations.dashboard['7.3.0'](doc700, mockLogger);
+
+  const parsedSearchSource = JSON.parse(newDoc.attributes.kibanaSavedObjectMeta.searchSourceJSON);
+  expect(parsedSearchSource.filter.length).toBe(0);
+  expect(parsedSearchSource.query.query).toBe('user:spiderman');
+
+  expect(newDoc.attributes.uiStateJSON).toBeUndefined();
+});
+
 test('dashboard migration 7.3.0 migrates panels', () => {
   const doc: DashboardDoc700To720 = {
     id: '1',

src/legacy/core_plugins/kibana/public/dashboard/migrations/types.ts

@@ -129,7 +129,7 @@ export interface RawSavedDashboardPanelTo60 {
   readonly size_y?: number;
   readonly row: number;
   readonly col: number;
-  panelIndex: number | string; // earlier versions allowed this to be number or string
+  panelIndex?: number | string; // earlier versions allowed this to be number or string. Some very early versions seem to be missing this entirely
   readonly name: string;
 
   // This is where custom panel titles are stored prior to Embeddable API v2