I'll point out again that you cannot have a 2 member SHC. It's not supported. Secondly, you cannot run ES on a single member of a SHC. All apps must be homogenous across a SHC.
If the intent is to have two separate search heads, one for ES and one for non-ES, then that is workable, depending on ingest and users' adhoc search load, in a 2 SH/2 IDX environment. ES consumes large amounts of search head and indexer resources regardless of the ingest level due to DMAs. You will not be able to get by on minimum system resources and have a positive experience.
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