How do i optimize the following Splunk query? - splunk

Question

I have results like below:
1. DateTime=2019-07-02T16:17:20,913 Thread=[], Message=[Message(userId=124, timestamp=2019-07-02T16:17:10.859Z, notificationType=CREATE, userAccount=UserAccount(firstName=S, lastName=K, emailAddress=abc#xyz.com, status=ACTIVE), originalValues=OriginalValue(emailAddress=null)) Toggle : true]
2. DateTime=2019-07-02T16:18:20,913 Thread=[], Message=[Message(userId=124, timestamp=2019-07-02T16:17:10.859Z, notificationType=CREATE, userAccount=UserAccount(firstName=S, lastName=K, emailAddress=abc#xyz.com, status=ACTIVE), originalValues=OriginalValue(emailAddress=new#xyz.com)) Toggle : true]
3. DateTime=2019-07-02T16:19:20,913 Thread=[], Message=[Message(userId=124, timestamp=2019-07-02T16:17:10.859Z, notificationType=CREATE, userAccount=UserAccount(firstName=S, lastName=K, emailAddress=abc#xyz.com, status=ACTIVE), originalValues=OriginalValue(emailAddress=new#xyz.com)) Toggle : true]
And I am trying to group results where the contents of the entire "Message" field is same and "emailAddress=null" is not contained in the Message.
So in the results above 2 and 3 should be the output.
The following query works fine for me but I need to optimize it further according to the following conditions:
Working Query: index=app sourcetype=appname host=appname* splunk_server_group=us-east-2 | fields Message | search Message= "[Message*" | regex _raw!="emailAddress=null" | stats count(Message) as count by Message | where count > 1
Conditions to optimize
Cannot rex against raw
Message key/value pair needs to be in the main search, not a sub-search

Answer 1

You don't have any subsearches in your current query. A subsearch is a query surrounded by square brackets.
What's wrong with rex against _raw?
Try this:
index=app sourcetype=appname host=appname* splunk_server_group=us-east-2 Message="[Message*"
| fields Message
| regex Message!="emailAddress=null"
| stats count(Message) as count by Message | where count > 1