This function takes the name of an array and renames all fields of this array.

array:rename() requires that the input array has continuous, sequential indexes with no gaps (empty indexes). If there are gaps, only the fields from index 0 up to the first empty index will be renamed. If no array with the given name exists or the old and the new name are the same, the function does nothing.

Without this function, each element of an array would need to be renamed individually with the rename() function, or array:filter() should be used as a workaround as shown below:

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array:filter(array="a[]", function={true}, var="", asArray="b[]") 
| array:filter(array="a[]", function={false}, var="")

With the function, specify the name of the array to rename:

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array:rename("a[]", asArray="b[]")
ParameterTypeRequiredDefault ValueDescription
array[a]stringrequired  Name of the array to rename. Must follow valid Array Syntax for array of scalars. For example, for events with fields incidents[0], incidents[1], ... this would be incidents[].
asArraystringrequired  The new name of the array. Must follow valid Array Syntax for array of scalars.

[a] The argument name array can be omitted.

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Rename Existing Fields in Array

Query
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array:rename(array="mail[]", asArray="user.email[]")
Introduction

If an array has continuous, sequential indexes with no empty indexes, the array:rename() function can be used to rename existing fields in an array. In this example, the array:rename() function is used to rename the array mail[] as user.email[].

Example incoming data might look like this: 

'mail[0]'='user0@example.com'
'mail[1]'='user1@example.com'
'mail[2]'='user2@example.com'

Step-by-Step

  1. Starting with the source repository events

  2. logscale
    array:rename(array="mail[]", asArray="user.email[]")

    Renames the array mail[] as user.email[]. If there are empty entries in the array, only the fields from index 0 up to the first empty index will be renamed. If an array with the new name already exists, it will be overwritten.

  3. Event Result set

Summary and Results

The query is used to rename fields in an array. Renaming the mail[] array is useful when, for example, modifying vendor logs email addresses into ECS data model is needed.

Sample output from the incoming example data: 

user.email[0]->user0@example.com
user.email[1]->user1@example.com 
user.email[2]->user2@example.com