Variable string processing in variable string in map command

[litmuspaper]

IF the _raw is the same as above, I want to search with the query below.

Index=_internal sourcetype=splunkd

I want to use the map command with the contents of the C column. Without putting A and B columns in the map command

NO  ->>  | map search="search earliest=-1d@d latest=now index=$a$ sourcetype=$b$"

I used this SPL, but it did not produce the desired result.

| map search="search earliest=-1d@d latest=now $c$"

I guess this query seems to mean this.

search earliest=-1d@d latest=now index=$a$ sourcetype=$b$

Help, Variable string processing in variable string in map command. Please

[richgalloway]

All searches should specify an index for better performance.  Those searches that do not specify an index will search the role's default index(es), which may not include the desired index.  If your role does not include "_internal" as a default index then searching "$c$" will return nothing if "$c$" only exists in the internal index.