Elasticsearc 5 pipeline grok pattern_definitions issue

Elastic Stack Elasticsearch
3

Hi there, to which part of your pattern are you referring to when you say it cannot be escaped?

here is an example call where I am matching a literal . using escaping

POST _ingest/pipeline/_simulate
{
  "pipeline" :
  {
  "description": "grok_apache_combined_01",
  "processors": [
    {
      "grok": {
        "field": "message",
        "patterns": ["%{MYPAT}"],
        "pattern_definitions" : {
          "MYPAT" : "\\."
        }
      }
	}]},
  "docs": [
    {
      "_index": "index",
      "_type": "type",
      "_id": "id",
      "_source": {
        "message": "."
      }
    }
  ]
}

because of how the string is parsed, a double \\ is required.