remove a field after indexing

[FranckFreiburger]

Hello,
Is it possible to remove a field once it has been indexed ?

my document is:

- index
- content
- pageNum
- filename

my index config:

this.setRef('index');
this.addField('content');
this.saveDocument(true);

Since I have multiple big files, I want to reduce memory (and disk space) usage.
My need is to find a filemane/pageNum from a word (in content), and I never need content after indexing.

I tried this (with success):

	for ( var id in idx.documentStore.docs )
		delete idx.documentStore.docs[id].content;

but I wondering if there is a better way to achieve this with the public API.