Seeing what's occupying all the space in the index

[Rob Staveley (Tom)]

I am indexing e-mail in a compound index and for e-mail which is stored in
~60G (in Bzip2 compressed form), I have an index which is now 80G.

Is there a tool I can use to see how much of the index is occupied by the
different fields I am indexing?

PS: I am a newbie to the mailing list - I hope I've got the etiquette right

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