[nodejs client] fix hookup issues in src/core/server/core_usage_data_…

…service.ts (#1225)

Fix issues in src/core/server/core_usage_data_service.ts.
Change types of property docsCount,docsDeleted,storeSizeBytes
and primaryStoreSizeBytes from 'string | undefined to 'number'.

Issue Resolved: #1224
Partical Resolved: #837

Signed-off-by: Anan Zhuang <ananzh@amazon.com>

src/core/server/core_usage_data/core_usage_data_service.ts

@@ -122,10 +122,12 @@ export class CoreUsageDataService implements CoreService<void, CoreUsageDataStar
                 index,
                 this.opensearchDashboardsConfig!.index
               ),
-              docsCount: stats['docs.count'],
-              docsDeleted: stats['docs.deleted'],
-              storeSizeBytes: stats['store.size'],
-              primaryStoreSizeBytes: stats['pri.store.size'],
+              docsCount: stats['docs.count'] ? parseInt(stats['docs.count'], 10) : 0,
+              docsDeleted: stats['docs.deleted'] ? parseInt(stats['docs.deleted'], 10) : 0,
+              storeSizeBytes: stats['store.size'] ? parseInt(stats['store.size'], 10) : 0,
+              primaryStoreSizeBytes: stats['pri.store.size']
+                ? parseInt(stats['pri.store.size'], 10)
+                : 0,
             };
           });
       })