DOCS-14257 db.collection.dropIndexes() 5.0 blurb update

Author: ianf-mongodb

source/core/index-creation.txt

@@ -554,7 +554,9 @@ process:
   * - Mark the Index as Ready
 
     - The :binary:`~bin.mongod` updates the index metadata to 
-      mark the index as ready for use.
+      mark the index as ready for use.     
+      
+      .. _index-build-process-ready:
 
   * - Lock
 

source/includes/fact-5.0-dropindexes-inprog.rst

@@ -0,0 +1,6 @@
+The :method:`db.collection.dropIndexes()` command cannot drop 
+:ref:`ready indexes <index-build-process-ready>` 
+if there are any in-progress index builds.
+
+- In versions 4.4.0-4.4.4 of MongoDB, this logic was not true 
+  due to a bug.

source/reference/method/db.collection.dropIndexes.txt

@@ -109,6 +109,11 @@ Definition
 Behavior
 --------
 
+Cannot Drop ``Ready`` Indexes During In-Progress Index Builds
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. include:: /includes/fact-5.0-dropindexes-inprog.rst
+
 Kill related queries only
 ~~~~~~~~~~~~~~~~~~~~~~~~~
 

source/release-notes/5.0.txt

@@ -237,6 +237,11 @@ truncations.
 Indexes
 -------
 
+Cannot Drop ``Ready`` Indexes During In-Progress Index Builds
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. include:: /includes/fact-5.0-dropindexes-inprog.rst
+
 Removal of ``geoHaystack`` Index and the ``geoSearch`` Command
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~