Long time ago now but if anyone else comes looking here's a solution
Best thing to do is in props if you're using KV_MODE=XML take that off, if you're not using KV, no worries. Then EVAL<field_name> = spath all the fields you want to keep
EVAL-ZIP = spath(_raw,'explanation_of_benefits.member.address.zip')
This will give you a field called ZIP with the value you need and no full path.
Also if you still need to get back to the full paths temporally for any reason (looking at a new field) you can just use spath again in the search head:
index=explain sourcetype=benifits | spath
This will give you all the paths in the _raw
Hope this helps someone.
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