Docs: Add known issue for removing x-pack

6.4 can no longer remove the x-pack plugin so users must remove it before upgrading to 6.4+. We've already updated the upgrade documentation. This updates the release notes and breaking changes docs. Closes #34307
elastic · Oct 17, 2018 · 1cd27e7 · 1cd27e7
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diff --git a/docs/reference/migration/migrate_6_4.asciidoc b/docs/reference/migration/migrate_6_4.asciidoc
@@ -7,6 +7,16 @@
 This section discusses the changes that you need to be aware of when migrating
 your application to Elasticsearch 6.4.
 
+[IMPORTANT]
+.bin/plugin can no longer remove x-pack
+=========================================
+
+`bin/plugin remove x-pack` no longer works. You should remove the {xpack}
+plugin before upgrading to 6.4 or any later versions. More instructions
+available in <<rolling-upgrades>> and <<restart-upgrade>>.
+
+=========================================
+
 * <<breaking_64_api_changes>>
 * <<breaking_64_scripting_changes>>
 

diff --git a/docs/reference/release-notes/6.4.asciidoc b/docs/reference/release-notes/6.4.asciidoc
@@ -98,9 +98,18 @@ Caused by: org.elasticsearch.common.xcontent.XContentParseException: [-1:####] [
 
 ======================================================
 
+[IMPORTANT]
+.bin/plugin can no longer remove x-pack
+=========================================
+
+`bin/plugin remove x-pack` no longer works. You should remove the {xpack}
+plugin before upgrading to 6.4 or any later versions.
+
+=========================================
+
 [float]
 === Known issues
-See the important section above.
+See the important sections above.
 
 {es} 6.4.0 fails to start when PEM encoded private key files that have been exported from `PKCS#12`
 keystores are in use. These files can be identified by the existence of lines that start with either