PutElasticsearchHttpRecord - Requested array size exceeds VM size limit

[#1]

I have a processor tree that I'm testing out with large json objects (1GB each). The tree is basically

GetFile -> UpdateAttribute (add avro schema name) -> PutElasticsearchHttpRecord

But PutElasticsearchHttpRecord gives me the following error (see screenshot)

Can anybody tell me what's wrong? I have already assigned enough RAM in bootstrap.conf in NiFi:

# JVM memory settings
java.arg.2=-Xms16g
java.arg.3=-Xmx32g

[#2]

@mburgessany suggestions? at the moment I am using SplitRecord -> PutElasticsearchHttpRecord and splitting it into 100,000 but it's pretty slow in comparison