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[[coerce]]
=== `coerce`
Data is not always clean. Depending on how it is produced a number might be
rendered in the JSON body as a true JSON number, e.g. `5`, but it might also
be rendered as a string, e.g. `"5"`. Alternatively, a number that should be
an integer might instead be rendered as a floating point, e.g. `5.0`, or even
`"5.0"`.
Coercion attempts to clean up dirty values to fit the datatype of a field.
For instance:
* Strings will be coerced to numbers.
* Floating points will be truncated for integer values.
For instance:
[source,js]
--------------------------------------------------
PUT my_index
{
"mappings": {
"my_type": {
"properties": {
"number_one": {
"type": "integer"
},
"number_two": {
"type": "integer",
"coerce": false
}
}
}
}
}
PUT my_index/my_type/1
{
"number_one": "10" <1>
}
PUT my_index/my_type/2
{
"number_two": "10" <2>
}
--------------------------------------------------
// CONSOLE
// TEST[catch:request]
<1> The `number_one` field will contain the integer `10`.
<2> This document will be rejected because coercion is disabled.
TIP: The `coerce` setting is allowed to have different settings for fields of
the same name in the same index. Its value can be updated on existing fields
using the <<indices-put-mapping,PUT mapping API>>.
[[coerce-setting]]
==== Index-level default
The `index.mapping.coerce` setting can be set on the index level to disable
coercion globally across all mapping types:
[source,js]
--------------------------------------------------
PUT my_index
{
"settings": {
"index.mapping.coerce": false
},
"mappings": {
"my_type": {
"properties": {
"number_one": {
"type": "integer",
"coerce": true
},
"number_two": {
"type": "integer"
}
}
}
}
}
PUT my_index/my_type/1
{ "number_one": "10" } <1>
PUT my_index/my_type/2
{ "number_two": "10" } <2>
--------------------------------------------------
// CONSOLE
// TEST[catch:request]
<1> The `number_one` field overrides the index level setting to enable coercion.
<2> This document will be rejected because the `number_two` field inherits the index-level coercion setting.
|
