Merge branch 'brad-homebrew-line-115' into 'master'

Note that Homebrew must be installed on the Mac on line 115

See merge request gitlab-org/gitlab!70712

doc/integration/elasticsearch.md

@@ -113,6 +113,9 @@ sudo yum install libicu-devel
 
 #### macOS
 
+NOTE:
+You must first [install Homebrew](https://brew.sh/).
+
 To install on macOS, run:
 
 ```shell