What are the rules for index names in Elastic Search?


J.Done:

What is the limit length for index names? What characters can be used in index names?

Thanks in advance.

value:

If you try to create an index with a name longer than 255 characters (or ~100 UTF-8 encoded bytes), you will get an error like this

InvalidIndexNameException[Invalid index name [...], index name is too long, (266 > 255)]

As for valid characters to use in the index, the best place to look is in their test suite , but basically the index name

  • Must not contain the characters #, \, /, *, ?, ", <, >, |,,
    • Since ES 7.0, :it is also not allowed
  • cannot be started _with, -or+
  • shall not be .or..
  • must be lowercase

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