[DOCS-7359] Update Indexing by Date Range description in Search Enterprise 4.0 (#1598)

* [DOCS-7359] Update Indexing by Date Range description

* Fix typo

Author: monikamichalska

search-enterprise/latest/admin/index.md

@@ -198,6 +198,8 @@ The following sample re-indexes all the nodes in the Alfresco Repository which h
   --alfresco.reindex.toTime=202104180000
 ```
 
+> **Note:** Bulk indexing by date range is not recommended for the entire repository because the meta-data indexing speed is slower. Indexing by date range is intended to be used for a targeted re-index of a small portion of the repository. For example, all updates in the last 24 hours.
+
 ## Deploying at Scale
 
 This section describes how to run Search Enterprise at scale. Recommendations are based on testing carried out against a 50 million node repository.