We recently created an index with ElasticSearch 2.2. We repopulated the index with all the documents we have in our old ElasticSearch 1.7.2 cluster. The size on disk for each shard on ES 2.2 is approx. 2 times bigger than what it was on ES 1.7.2. Total number of documents in both clusters is same.
I am confused as I do not find any reason for that increase in size. Is there something which I am missing?
It is worthy to mention here that we use "_cat/shards" to find out size on disk for each shard.