[[modules-scripting-groovy]]
=== Groovy Scripting Language

Groovy is the default scripting language available in Elasticsearch.  Although
limited by the <<java-security-manager,Java Security Manager>>, it is not a
sandboxed language and only `file` scripts may be used by default.

Enabling `inline` or `stored` Groovy scripting is a security risk and should
only be considered if your Elasticsearch cluster is protected from the outside
world. Even a simple `while (true) { }` loop could behave as a denial-of-
service attack on your cluster.

See <<modules-scripting-security, Scripting and Security>> for details
on security issues with scripts, including how to customize class
whitelisting.

[float]
=== Doc value properties and methods

Doc values in Groovy support the following properties and methods (depending
on the underlying field type):

`doc['field_name'].value`::
    The native value of the field. For example, if its a short type, it will be short.

`doc['field_name'].values`::
    The native array values of the field. For example, if its a short type,
     it will be short[]. Remember, a field can have several values within a
     single doc. Returns an empty array if the field has no values.

`doc['field_name'].empty`::
    A boolean indicating if the field has no values within the doc.

`doc['field_name'].lat`::
    The latitude of a geo point type, or `null`.

`doc['field_name'].lon`::
    The longitude of a geo point type, or `null`.

`doc['field_name'].lats`::
    The latitudes of a geo point type, or an empty array.

`doc['field_name'].lons`::
    The longitudes of a geo point type, or an empty array.

`doc['field_name'].arcDistance(lat, lon)`::
    The `arc` distance (in meters) of this geo point field from the provided lat/lon.

`doc['field_name'].arcDistanceWithDefault(lat, lon, default)`::
    The `arc` distance (in meters) of this geo point field from the provided lat/lon with a default value
    for empty fields.

`doc['field_name'].planeDistance(lat, lon)`::
    The `plane` distance (in meters) of this geo point field from the provided lat/lon.

`doc['field_name'].planeDistanceWithDefault(lat, lon, default)`::
    The `plane` distance (in meters) of this geo point field from the provided lat/lon with a default value
    for empty fields.

`doc['field_name'].geohashDistance(geohash)`::
    The `arc` distance (in meters) of this geo point field from the provided geohash.

`doc['field_name'].geohashDistanceWithDefault(geohash, default)`::
    The `arc` distance (in meters) of this geo point field from the provided geohash with a default value
    for empty fields.


[float]
=== Groovy Built In Functions

There are several built in functions that can be used within scripts.
They include:

[cols="<,<",options="header",]
|=======================================================================
|Function |Description
|`sin(a)` |Returns the trigonometric sine of an angle.

|`cos(a)` |Returns the trigonometric cosine of an angle.

|`tan(a)` |Returns the trigonometric tangent of an angle.

|`asin(a)` |Returns the arc sine of a value.

|`acos(a)` |Returns the arc cosine of a value.

|`atan(a)` |Returns the arc tangent of a value.

|`toRadians(angdeg)` |Converts an angle measured in degrees to an
approximately equivalent angle measured in radians

|`toDegrees(angrad)` |Converts an angle measured in radians to an
approximately equivalent angle measured in degrees.

|`exp(a)` |Returns Euler's number _e_ raised to the power of value.

|`log(a)` |Returns the natural logarithm (base _e_) of a value.

|`log10(a)` |Returns the base 10 logarithm of a value.

|`sqrt(a)` |Returns the correctly rounded positive square root of a
value.

|`cbrt(a)` |Returns the cube root of a double value.

|`IEEEremainder(f1, f2)` |Computes the remainder operation on two
arguments as prescribed by the IEEE 754 standard.

|`ceil(a)` |Returns the smallest (closest to negative infinity) value
that is greater than or equal to the argument and is equal to a
mathematical integer.

|`floor(a)` |Returns the largest (closest to positive infinity) value
that is less than or equal to the argument and is equal to a
mathematical integer.

|`rint(a)` |Returns the value that is closest in value to the argument
and is equal to a mathematical integer.

|`atan2(y, x)` |Returns the angle _theta_ from the conversion of
rectangular coordinates (_x_, _y_) to polar coordinates (r,_theta_).

|`pow(a, b)` |Returns the value of the first argument raised to the
power of the second argument.

|`round(a)` |Returns the closest _int_ to the argument.

|`random()` |Returns a random _double_ value.

|`abs(a)` |Returns the absolute value of a value.

|`max(a, b)` |Returns the greater of two values.

|`min(a, b)` |Returns the smaller of two values.

|`ulp(d)` |Returns the size of an ulp of the argument.

|`signum(d)` |Returns the signum function of the argument.

|`sinh(x)` |Returns the hyperbolic sine of a value.

|`cosh(x)` |Returns the hyperbolic cosine of a value.

|`tanh(x)` |Returns the hyperbolic tangent of a value.

|`hypot(x, y)` |Returns sqrt(_x2_ + _y2_) without intermediate overflow
or underflow.
|=======================================================================