I have a simple search:
index =abc OR index =xxx |transaction DIGEST | eval match_count=mvcount(sourcetype) | eval Digest_MATCH=if(match_count==2,"MATCH","MISSING") | table _time, DIGEST, Digest_MATCH, sourcetype
I want store all rows where digest_match = missing into KV store and lookup values to see if there any matches for missing values in future searches.
You'll need to use the outputlookup command to push those results into a lookup. From there, you can convert your lookup table to a KV Store.
Here is a great posting on this subject