c# - Elasticsearch - Indexing missing while updating alias -


per blog post: https://www.elastic.co/blog/changing-mapping-with-zero-downtime/, using recommended best practice updating index in production 0 downtime using aliases. despite this, periodically seeing "index missing" exceptions across our application while update running. cannot seem diagnose behavior, , not sure issue be.

current process

  • determine index being targeted default alias (there's @ 1)
  • sequence current index name appending/incrementing counter: index-name-v1
  • create new index , populate data
  • update alias in 1 operation: remove old index , add new index
  • delete index -2 versions current index -- done ensure index returning data prior alias update not deleted

despite this, we're getting random , regular index missing errors when querying data. alias never removed, updated atomically. there flawed approach not considering?

public virtual void swapalias(string aliasname, string oldindexname, string newindexname) {     client.alias(a =>     {         a.add(add => add.alias(aliasname).index(newindexname));          if (oldindexname != null && oldindexname != newindexname)             a.remove(remove => remove.alias(aliasname).index(oldindexname));          return a;     }); }


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