Equivalent setting for following mapping in Elasticsearch 5.x

Elastic Stack Elasticsearch
#1

I've tried to find out an equivalent for mapping mentioned below, but couldn't succeed.

{
	"type": "string",
	"null_value": "NULL"
}

When I try the following:

{
	"type": "text",
	"null_value": "NULL"
}

It is giving unsupported parameter for text error.

Can someone provide pointers to fix this?

Thanks in Advance!

#2

For now, the only way to solve that I believe is at index time or using an ingest script processor.

I opened the following issue for discussion:

See also

#3

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