Hello Sunil,
You can do by renaming the fields.
index=A OR index=B|rename ipaddress as sourceip|stats avg(packets) by sourceip
OR
|multisearch [search index=A|table name,packets,sourceip][search index=B | table category,classification,ipaddress|rename ipaddress as sourceip]|stats avg(packets) by sourceip
Thanks,
L
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