Question

Is it possible to query Elasticsearch giving it a range of strings?

Something that I’d imagine like:

Sample Mapping:

     {
      "resource" : {
        "properties" : {
          "Title" : {
            "type" : "string"
          },
          "type_" : {
            "index" : "not_analyzed",
            "type" : "string"
          },
           "Summary" : {
            "format" : "dateOptionalTime",
            "type" : "date"
          }
        }
      }
    }

Sample Query:

{
  "size" : 10,
  "query" : {
    "filtered" : {
      "query" : {
        "bool" : {
          "should" : [ {
            "text" : {
              "Title" : {
                "query" : "AAA",
                "type" : "phrase_prefix"
              }
            }
          }, {
            "range" : {
              "Title" : {
                "from" : "BBB",
                "to" : "CCC",
                "include_lower" : true,
                "include_upper" : true
              }
            }
          } ],
          "minimum_number_should_match" : 1
        }
      },
      "filter" : {
        "and" : {
          "filters" : [{
            "or" : {
              "filters" : [ {
                "term" : {
                  "type_" : "personType"
                }
              } ]
            }
          } ]
        }
      }
    }
  }
}

Data Indexed:
Resources with Titles ‘AAA’, ‘BBB’, ‘CCC’, ‘DDD’

Result
Resource with Title ‘AAA’ (range didn’t select ‘BBB’ and ‘CCC’)

Any help appreciated

Answer 1

By default ElasticSearch keeps all indexed data lowercase. It does not lowercase the queries, though. Great.

To wrap up: after sending the queries (from and to values) all in lowercase the range searching works like a charm.