[backport 2.x] Update data source name and rebase code in maps (#1147) (

#1158) (#1165)

(cherry picked from commit 424f59c)

Signed-off-by: Junqiu Lei <junqiu@amazon.com>
(cherry picked from commit 7d33af6)

Co-authored-by: Junqiu Lei <junqiu@amazon.com>

cypress/integration/plugins/custom-import-map-dashboards/4_documentsLayer.spec.js

@@ -32,7 +32,7 @@ describe('Documents layer', () => {
       timeout: 120000,
     }).click();
     cy.contains('Documents', { timeout: 120000 }).click();
-    cy.contains('Select data source', { timeout: 120000 }).click({
+    cy.contains('Select index pattern', { timeout: 120000 }).wait(3000).click({
       force: true,
     });
     cy.contains('opensearch_dashboards_sample_data_flights', {