title: Performance impact of using a string of length 100 characters as _Id column in Elastic Search
body: <p>I am planning to store events in elastic search. It can have around 100 million events at any point time. To de-dupe events, I am planning to create _id column of length 100 chars by concatenating below fields
  entity_id - UUID (37 chars) + 
  event_creation_time (30 chars) + 
  event_type (30 chars) </p>
  
  <p>This store will be having normal reads &amp; writes along with aggregate queries (no updates / deletes)
  Can you please let me know if there would be any performance impact or any other side-effects of using such lengthy string _id columns instead of default Ids.</p>
  
  <p>Thanks,
  Harish</p>