I've concluded that I absolutely need to use mapping, as I need to run the same (large) search query for each Iteration, the list of which must be found through another search. The Iteration must be referenced several times throughout this large search. However, this search also contains other necessary subsearches which use the Iteration as a variable. It works when hardcoded, but I can't pass the $Iteration$ thing into the inner subsearch.
<search to find Iterations>
| map
[ search index=caac sourcetype=UserStory _time<[| inputlookup caac_900_Sprint_Dates_lu where Iteration=$Iteration$ | return $epochSprintBegDate] ]
The actual search is much larger, but this is the portion of interest.
This will return the error: "Error in 'search' command: Unable to parse the search: Comparator '<' is missing a term on the right hand side."
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