I am looking to reduce the size of the ES object due to scaling requirements. After tests I have noticed that if I am using shorter field names, the object size becomes much smaller.
Does this mean that ES is storing field names as the part of the object??
I am using ES 2.4.1.
It is really complicated but the short answer is "sometimes".
Your document is stored exactly as is in the _source field which is stored in chunks and compressed. So that stores the field names, though probably only one copy per chunk.
In the index itself I expect the field names to be listed, but certainly not once per document on average.
I guess it all depends on how small the index is.
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