On blockchain's blockchain api documentation, located here
There is an api call that uses a parameter called block_index. What is this value, and how does it differ from block_height? From playing around with changing the block_index value in the following api call:
It seems like (imo quite arbitrarily, which adds to my confusion) that block_index 14849 corresponds to the genesis block. Finally, on the api page listed at the top the first example output they show gives a block whose index is 818044, yet when I enter the following api call into my browser's address bar:
I get "Block Not Found". Is this just a bug in blockchain.info that the example output they provide doesn't actually work, or am I using block_index incorrectly?