I have complex documents where I need a lot of nesting on more than 100 different nodes.
I first indexed my documents without nesting, which gave me a disk size ratio of around 1 : 0.4 (i.e. the ES index uses less than half the disk space of the original documents).
Next, I indexed the documents with nesting added, and quite shockingly, the ratio is now around 1:2.5 (so now the index is gobbling up extreme amounts of disk space).
Can somebody guess and explain what is going on?