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Groovy Scripting Language

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Groovy Scripting Language

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Deprecated in 5.0.0.

Groovy will be replaced by the new scripting language Painless

Groovy is available in Elasticsearch by default. Although limited by the 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 Scripting and Security for details on security issues with scripts, including how to customize class whitelisting.

Doc value properties and methods

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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.

Groovy Built In Functions

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

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.

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