[data views] Field retrieval - better handling of closed indices (#177370)

## Summary

The field caps api returns an error if an index pattern matches a closed
index. Now the error is handled and and an empty set is returned.

Closes: https://github.com/elastic/kibana/issues/173954

---------

Co-authored-by: Julia Rechkunova <julia.rechkunova@elastic.co>

src/plugins/data_views/server/fetcher/lib/es_api.ts

@@ -90,6 +90,10 @@ export async function callFieldCapsApi(params: FieldCapsApiParams) {
       { meta: true }
     );
   } catch (error) {
+    // return an empty set for closed indices
+    if (error.message.startsWith('cluster_block_exception')) {
+      return { body: { indices: [], fields: {} } };
+    }
     throw convertEsError(indices, error);
   }
 }

test/api_integration/apis/data_views/fields_for_wildcard_route/response.ts

@@ -227,5 +227,20 @@ export default function ({ getService }: FtrProviderContext) {
         })
         .expect(404);
     });
+
+    it('returns 200 when index is closed', async () => {
+      const es = getService('es');
+
+      await es.indices.close({ index: 'basic_index' });
+
+      await supertest
+        .get(FIELDS_FOR_WILDCARD_PATH)
+        .set(ELASTIC_HTTP_VERSION_HEADER, INITIAL_REST_VERSION_INTERNAL)
+        .query({ pattern: 'basic_index' })
+        .expect(200, {
+          fields: [],
+          indices: [],
+        });
+    });
   });
 }