Cherry-pick elastic#17425 to 7.7: Remove migrationVersion map 7.7.0 r…

…eference from Kibana dashboard file to avoid backward compat… (elastic#17494)

* Remove migrationVersion map 7.7.0 reference from Kibana dashboard file to avoid backward compat… (elastic#17425)

* Remove 7.7.0 reference from Kibana dashboard to avoid backward compatibility issues.

* Update CHANGELOG.next.asciidoc

(cherry picked from commit 92049c5)

* Fix cherrypick script error in CHANGELOG.next.asciidoc

CHANGELOG.next.asciidoc

@@ -118,6 +118,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Fix `elasticsearch.gc` fileset to not collect _all_ logs when Elasticsearch is running in Docker. {issue}13164[13164] {issue}16583[16583] {pull}17164[17164]
 - Fixed a mapping exception when ingesting CEF logs that used the spriv or dpriv extensions. {issue}17216[17216] {pull}17220[17220]
 - Fix issue 17734 to retry on rate-limit error in the Filebeat httpjson input. {issue}17734[17734] {pull}17735[17735]
+- Remove migrationVersion map 7.7.0 reference from Kibana dashboard file to fix backward compatibility issues. {pull}17425[17425]
 
 *Heartbeat*
 

x-pack/filebeat/module/okta/_meta/kibana/7/dashboard/749203a0-67b1-11ea-a76f-bf44814e437d.json

@@ -189,9 +189,6 @@
         }
       },
       "id": "281ca660-67b1-11ea-a76f-bf44814e437d",
-      "migrationVersion": {
-        "map": "7.7.0"
-      },
       "references": [
         {
           "id": "filebeat-*",