ElasticSearch escape character

[surajdalvi (Suraj)]

How I escape Unicode characters using a quer_string query? For example, my documents consist the following data:

{
    "title":"@Sachin#$Tendular%^^*bestplayer*(tiger)!god~~ofcricket"
     } 

I am using the query_string query in the following way:

{
  "query": {
    "query_string": {
      "fields": ["title"],
      "query": "*@Sachin#$Tendular%^^*bestplayer*(tiger)!god~~ofcricket*"
    }
  }
}

I am not getting any result so How I will escape the character to get a result?

[HenningAndersen]

You can use \ (backslash) to escape characters. Beware that JSON also uses backslash as escape character and you will need to put in two backslashes like this:

{
  "query": {
    "query_string": {
      "fields": ["title"],
      "query": "\"@Sachin#$Tendular%\\^\\^\\*bestplayer\\*\\(tiger\\)\\!god\\~\\~ofcricket\""
    }
  }
}

Adding quotes around the text turns it into a single phrase query.

If you want to escape unicode characters, you can use the \u notation:

{
  "query": {
    "query_string": {
      "fields": ["title"],
      "query": "\u00e5"
    }
  }
}

See: https://www.elastic.co/guide/en/elasticsearch/reference/6.5/query-dsl-query-string-query.html for more information.