All array fields starting with index from and ending with index to are selected. If some index is missing, the concatenation stops with the previous index, thus if only index 0, 1 and 3 are present, only index 0 and 1 are concatenated. If the first index is missing, no field is added to the event.
|field||string||Yes||Base name for array fields to concatenate.|
|as||string||No||_concatArray||Name of output field.|
|from||number||No||0||First array index to include [0..∞].|
|to||number||No||Last array index to include (leave out to get all). Must be equal to or larger than from.|
|prefix||string||No||Prefix to prepend to the generated string.|
|separator||string||No||Separator between values.|
|suffix||string||No||Suffix to append to the generated string.|
field is the unnamed parameter.
Concatenate the values of fields server, server and so on and put it into a new field named _concatArray.
Put the result into a field named servers.
Select only fields with indexes 1 to 3.
concatArray(server, from=1, to=3)
Add a separator between concatenated values.
concatArray(server, separator=", ")
Add a prefix and suffix to the generated string.
concatArray(server, prefix="[", suffix="]")