feat(search-indexes): clarify search index management support (#5158)

Author: mcasimir

packages/compass-indexes/src/components/indexes-toolbar/indexes-toolbar.tsx

@@ -181,7 +181,17 @@ export const IndexesToolbar: React.FunctionComponent<IndexesToolbarProps> = ({
                       </SegmentedControlOption>
                     )}
                   >
-                    Search indexes are unavailable in your current connection.
+                    <p>
+                      The Atlas Search index management in Compass is only
+                      available for Atlas local deployments and M10+ clusters
+                      running MongoDB 6.0.7 or newer.
+                    </p>
+                    <p>
+                      For clusters running an earlier version of MongoDB or
+                      shared tier clusters you can manage your Atlas Search
+                      indexes from the Atlas web UI, with the CLI, or with the
+                      Administration API.
+                    </p>
                   </Tooltip>
                 )}
                 {isAtlasSearchSupported && (