Transformations > Expression transformation > Hierarchical data in an elastic mapping
  

Hierarchical data in an elastic mapping

In an elastic mapping, you can use hierarchical fields that represent an array, map, or struct.
You can use hierarchical fields as pass-through fields. You can also use hierarchical fields in an expression or use a hierarchical field with a complex operator to access primitive child fields in the expression. For more information about complex operators, see Function Reference.
Consider the following guidelines when you use hierarchical fields in an expression: