How to understand this tip? From The Definitive Guide
Searching 1 index of 50 shards is exactly equivalent to searching 50 indices with 1 shard each: both search requests hit 50 shards.
I have 2048G of Data and 8 machines. From this tip, I can create 1 index with 70 shards or 10 indexes with 7 shards each index. Both are 70 shards.
If I have 2 search implementation. 1) For 1 index, I use one thread to search. 2) For 10 indexes, I use 10 threads, each thread search one index.
Which implementation has better performance? or they're exactly same?