diff --git a/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/default/flyout.tsx b/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/default/flyout.tsx
index 439062e027650..9262ea9664033 100644
--- a/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/default/flyout.tsx
+++ b/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/default/flyout.tsx
@@ -62,7 +62,9 @@ export const DefaultDeprecationFlyout = ({
     <>
       <EuiFlyoutHeader hasBorder>
         <EuiTitle size="s" data-test-subj="flyoutTitle">
-          <h2>{message}</h2>
+          <h2 id="defaultDeprecationDetailsFlyoutTitle" className="eui-textBreakWord">
+            {message}
+          </h2>
         </EuiTitle>
         {index && (
           <EuiText data-test-subj="flyoutDescription">
@@ -74,7 +76,7 @@ export const DefaultDeprecationFlyout = ({
       </EuiFlyoutHeader>
       <EuiFlyoutBody>
         <EuiText>
-          <p>{details}</p>
+          <p className="eui-textBreakWord">{details}</p>
           <p>
             <EuiLink target="_blank" href={url}>
               {i18nTexts.learnMoreLinkLabel}
diff --git a/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/index_settings/flyout.tsx b/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/index_settings/flyout.tsx
index 1567562db53ee..edb46ee0dc85b 100644
--- a/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/index_settings/flyout.tsx
+++ b/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/index_settings/flyout.tsx
@@ -110,7 +110,7 @@ export const RemoveIndexSettingsFlyout = ({
     <>
       <EuiFlyoutHeader hasBorder>
         <EuiTitle size="s" data-test-subj="flyoutTitle">
-          <h2>{message}</h2>
+          <h2 id="indexSettingsDetailsFlyoutTitle">{message}</h2>
         </EuiTitle>
         <EuiText>
           <p>
diff --git a/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/ml_snapshots/flyout.tsx b/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/ml_snapshots/flyout.tsx
index 5d61b076119e7..a972b7ec192d2 100644
--- a/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/ml_snapshots/flyout.tsx
+++ b/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/ml_snapshots/flyout.tsx
@@ -169,7 +169,7 @@ export const FixSnapshotsFlyout = ({
     <>
       <EuiFlyoutHeader hasBorder>
         <EuiTitle size="s" data-test-subj="flyoutTitle">
-          <h2>{i18nTexts.flyoutTitle}</h2>
+          <h2 id="mlSnapshotDetailsFlyoutTitle">{i18nTexts.flyoutTitle}</h2>
         </EuiTitle>
       </EuiFlyoutHeader>
       <EuiFlyoutBody>
diff --git a/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/reindex/flyout/container.tsx b/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/reindex/flyout/container.tsx
index 23008a4f2f1b8..d2d07b47acd49 100644
--- a/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/reindex/flyout/container.tsx
+++ b/x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/reindex/flyout/container.tsx
@@ -131,7 +131,7 @@ export const ReindexFlyout: React.FunctionComponent<ReindexFlyoutProps> = ({
     <>
       <EuiFlyoutHeader hasBorder>
         <EuiTitle size="s" data-test-subj="flyoutTitle">
-          <h2>
+          <h2 id="reindexDetailsFlyoutTitle">
             <FormattedMessage
               id="xpack.upgradeAssistant.checkupTab.reindexing.flyout.flyoutHeader"
               defaultMessage="Reindex {index}"
diff --git a/x-pack/test/accessibility/apps/upgrade_assistant.ts b/x-pack/test/accessibility/apps/upgrade_assistant.ts
index b7c8939e350ac..690f258198ebc 100644
--- a/x-pack/test/accessibility/apps/upgrade_assistant.ts
+++ b/x-pack/test/accessibility/apps/upgrade_assistant.ts
@@ -19,6 +19,31 @@ const translogSettingsIndexDeprecation: IndicesCreateRequest = {
   },
 };
 
+const multiFieldsIndexDeprecation: IndicesCreateRequest = {
+  index: 'nested_multi_fields',
+  body: {
+    mappings: {
+      properties: {
+        text: {
+          type: 'text',
+          fields: {
+            english: {
+              type: 'text',
+              analyzer: 'english',
+              fields: {
+                english: {
+                  type: 'text',
+                  analyzer: 'english',
+                },
+              },
+            },
+          },
+        },
+      },
+    },
+  },
+};
+
 export default function ({ getService, getPageObjects }: FtrProviderContext) {
   const PageObjects = getPageObjects(['upgradeAssistant', 'common']);
   const a11y = getService('a11y');
@@ -32,10 +57,11 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
       await PageObjects.upgradeAssistant.navigateToPage();
 
       try {
-        // Create an index that will trigger a deprecation warning to test the ES deprecations page
+        // Create two indices that will trigger deprecation warnings to test the ES deprecations page
+        await es.indices.create(multiFieldsIndexDeprecation);
         await es.indices.create(translogSettingsIndexDeprecation);
       } catch (e) {
-        log.debug('[Setup error] Error creating index');
+        log.debug('[Setup error] Error creating indices');
         throw e;
       }
     });
@@ -43,10 +69,10 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
     after(async () => {
       try {
         await es.indices.delete({
-          index: [translogSettingsIndexDeprecation.index],
+          index: [multiFieldsIndexDeprecation.index, translogSettingsIndexDeprecation.index],
         });
       } catch (e) {
-        log.debug('[Cleanup error] Error deleting index');
+        log.debug('[Cleanup error] Error deleting indices');
         throw e;
       }
     });
@@ -58,22 +84,46 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
       await a11y.testAppSnapshot();
     });
 
-    it('Elasticsearch deprecations page', async () => {
-      await PageObjects.common.navigateToUrl(
-        'management',
-        'stack/upgrade_assistant/es_deprecations',
-        {
-          ensureCurrentUrl: false,
-          shouldLoginIfPrompted: false,
-          shouldUseHashForSubUrl: false,
-        }
-      );
-
-      await retry.waitFor('Elasticsearch deprecations table to be visible', async () => {
-        return testSubjects.exists('esDeprecationsTable');
+    describe('Elasticsearch deprecations page', () => {
+      beforeEach(async () => {
+        await PageObjects.common.navigateToUrl(
+          'management',
+          'stack/upgrade_assistant/es_deprecations',
+          {
+            ensureCurrentUrl: false,
+            shouldLoginIfPrompted: false,
+            shouldUseHashForSubUrl: false,
+          }
+        );
+
+        await retry.waitFor('Elasticsearch deprecations table to be visible', async () => {
+          return testSubjects.exists('esDeprecationsTable');
+        });
       });
 
-      await a11y.testAppSnapshot();
+      it('Deprecations table', async () => {
+        await a11y.testAppSnapshot();
+      });
+
+      it('Index settings deprecation flyout', async () => {
+        await PageObjects.upgradeAssistant.clickEsDeprecation(
+          'indexSettings' // An index setting deprecation was added in the before() hook so should be guaranteed
+        );
+        await retry.waitFor('ES index settings deprecation flyout to be visible', async () => {
+          return testSubjects.exists('indexSettingsDetails');
+        });
+        await a11y.testAppSnapshot();
+      });
+
+      it('Default deprecation flyout', async () => {
+        await PageObjects.upgradeAssistant.clickEsDeprecation(
+          'default' // A default deprecation was added in the before() hook so should be guaranteed
+        );
+        await retry.waitFor('ES default deprecation flyout to be visible', async () => {
+          return testSubjects.exists('defaultDeprecationDetails');
+        });
+        await a11y.testAppSnapshot();
+      });
     });
 
     describe('Kibana deprecations page', () => {
diff --git a/x-pack/test/functional/page_objects/upgrade_assistant_page.ts b/x-pack/test/functional/page_objects/upgrade_assistant_page.ts
index 406800d775417..e763145a715ff 100644
--- a/x-pack/test/functional/page_objects/upgrade_assistant_page.ts
+++ b/x-pack/test/functional/page_objects/upgrade_assistant_page.ts
@@ -57,4 +57,17 @@ export class UpgradeAssistantPageObject extends FtrService {
       this.log.debug('Unable to find selected deprecation row');
     }
   }
+
+  async clickEsDeprecation(deprecationType: 'indexSettings' | 'default' | 'reindex' | 'ml') {
+    const table = await this.testSubjects.find('esDeprecationsTable');
+    const deprecationIssueLink = await (
+      await table.findByTestSubject(`${deprecationType}TableCell-message`)
+    ).findByCssSelector('button');
+
+    if (deprecationIssueLink) {
+      await deprecationIssueLink.click();
+    } else {
+      this.log.debug('Unable to find selected deprecation');
+    }
+  }
 }