Fix #21653 - Tag search based on displayName (#21722)

* Fix #21653 - Tag search based on displayName

* added test

* update test to search by classification display name

---------

Co-authored-by: shrushti2000 <shrushtipolekar@gmail.com>

openmetadata-service/src/main/resources/json/data/searchSettings/searchSettings.json

@@ -1118,6 +1118,10 @@
         {
           "field": "classification.name",
           "boost": 7.0
+        },
+        {
+          "field": "classification.displayName",
+          "boost": 7.0
         }
       ],
       "aggregations": [

openmetadata-ui/src/main/resources/ui/playwright/e2e/Pages/Tags.spec.ts

@@ -437,3 +437,52 @@ test.fixme('Classification Page', async ({ page }) => {
     ).not.toBeVisible();
   });
 });
+
+test('Search tag using classification display name should work', async ({
+  page,
+}) => {
+  const displayNameToSearch = tag.responseData.classification.displayName;
+
+  await table.visitEntityPage(page);
+
+  await page.waitForLoadState('networkidle');
+
+  const initialQueryResponse = page.waitForResponse('**/api/v1/search/query?*');
+
+  await page
+    .getByTestId('KnowledgePanel.Tags')
+    .getByTestId('tags-container')
+    .getByTestId('add-tag')
+    .first()
+    .click();
+
+  await initialQueryResponse;
+
+  const tagSearchResponse = page.waitForResponse(
+    `/api/v1/search/query?q=*${encodeURIComponent(displayNameToSearch)}*`
+  );
+
+  // Enter the display name in the search box
+  await page.fill('[data-testid="tag-selector"] input', displayNameToSearch);
+
+  const response = await tagSearchResponse;
+  const searchResults = await response.json();
+
+  // Verify that we got search results
+  expect(searchResults.hits.hits.length).toBeGreaterThan(0);
+
+  // Verify that the classification display name is shown in search input
+  await expect(
+    page.locator('[data-testid="tag-selector"] > .ant-select-selector')
+  ).toContainText(displayNameToSearch);
+
+  // Verify that the tag with matching display name is shown in dropdown
+  await expect(
+    page.locator('.ant-select-dropdown').getByText(tag.responseData.displayName)
+  ).toBeVisible();
+
+  // Verify the tag is selectable in the dropdown
+  await expect(
+    page.getByTestId(`tag-${tag.responseData.fullyQualifiedName}`)
+  ).toBeVisible();
+});