LOAD CSV: mulitple MERGE and Eager operator

I have a large CSV file that contains mulitple nodes per line. I would like to use LOAD CSV to MERGE the nodes and set some properties. However, I always get the "Eager operator" warning for this query:

USING PERIODIC COMMIT
LOAD CSV FROM 'file:///MRCONSO.RRF' AS line FIELDTERMINATOR '|'
MERGE (c:Concept {cui: line[0]})
ON CREATE SET c.language = line[1]
MERGE (l:LexicalForm {lui: line[3]})
ON CREATE SET l.status = line[2];

When I remove the ON CREATE part it works but I want to merge on a specific ID, not on the combination of the ID and the other properties.

Is it possible to rephrase this somehow to avoid the Eager operator? I would like to create 6 different nodes from a single line and the alternative would be to iterate the file 6 times.