[role="xpack"]
[testenv="basic"]

[[unsigned-long]]
=== Unsigned long data type
Unsigned long is a numeric field type that represents an unsigned 64-bit
integer with a minimum value of 0 and a maximum value of +2^64^-1+
(from 0 to 18446744073709551615 inclusive).

[source,console]
--------------------------------------------------
PUT my_index
{
  "mappings": {
    "properties": {
      "my_counter": {
        "type": "unsigned_long"
      }
    }
  }
}
--------------------------------------------------

Unsigned long can be indexed in a numeric or string form,
representing integer values in the range [0, 18446744073709551615].
They can't have a decimal part.

[source,console]
--------------------------------
POST /my_index/_bulk?refresh
{"index":{"_id":1}}
{"my_counter": 0}
{"index":{"_id":2}}
{"my_counter": 9223372036854775808}
{"index":{"_id":3}}
{"my_counter": 18446744073709551614}
{"index":{"_id":4}}
{"my_counter": 18446744073709551615}
--------------------------------
//TEST[continued]

Term queries accept any numbers in a numeric or string form.

[source,console]
--------------------------------
GET /my_index/_search
{
    "query": {
        "term" : {
            "my_counter" : 18446744073709551615
        }
    }
}
--------------------------------
//TEST[continued]

Range query terms can contain values with decimal parts.
In this case {es} converts them to integer values:
`gte` and `gt` terms are converted to the nearest integer up inclusive,
and `lt` and `lte` ranges are converted to the nearest integer down inclusive.

It is recommended to pass ranges as strings to ensure they are parsed
without any loss of precision.

[source,console]
--------------------------------
GET /my_index/_search
{
    "query": {
        "range" : {
            "my_counter" : {
                "gte" : "9223372036854775808.5",
                "lte" : "18446744073709551615"
            }
        }
    }
}
--------------------------------
//TEST[continued]


For queries with sort on an `unsigned_long` field,
for a particular document {es} returns a sort value of the type `long`
if the value of this document is within the range of long values,
or of the type `BigInteger` if the value exceeds this range.

NOTE: REST clients need to be able to handle big integer values
in JSON to support this field type correctly.

[source,console]
--------------------------------
GET /my_index/_search
{
    "query": {
        "match_all" : {}
    },
    "sort" : {"my_counter" : "desc"}
}
--------------------------------
//TEST[continued]

Similarly to sort values, script values of an `unsigned_long` field
return a `Number` representing a `Long` or `BigInteger`.
The same values: `Long` or `BigInteger` are used for `terms` aggregations.

==== Stored fields
A stored field of `unsigned_long` is stored and returned as `String`.

==== Queries with mixed numeric types

Searches with mixed numeric types one of which is `unsigned_long` are
supported, except queries with sort. Thus, a sort query across two indexes
where the same field name has an `unsigned_long` type in one index,
and `long` type in another, doesn't produce correct results and must
be avoided. If there is a need for such kind of sorting, script based sorting
can be used instead.

Aggregations across several numeric types one of which is `unsigned_long` are
supported. In this case, values are converted to the `double` type.
