add doc

doc/03_Configuration/06_Mapping_Configuration/02_Transformation_Pipeline.md

@@ -62,6 +62,7 @@ and the second item reflects the value for the longitude attribute.
 - **Trim**: Removes leading and/or tailing white spaces from string.
 - **Static Text**: Adds a static text to the value - either prepends or appends it.
 - **Conditional Conversion**: String values are converted to other string values (e.g. '0' to '1' or 'csv-value' to 'object-value'). Multiple conversions can be configured by separating the values with pipe symbol ('|') (e.g. '0|1|2' to 'some|other|values'). An asterisk can be used as a wildcard (e.g. '0|\*' to 'no value|default' where '0' will be converted to 'no value' and all other values to 'default').
+- **ObjectField**: Extracts the value for a specified field from a DataObject. This is similar to `ObjectFieldGetter` or `AnyGetter`.
 
 #### What Operators are NOT supposed to do:
 - **Complex statistical calculations**: you possibly get an idea like that you can explode string to array and then calculate some average value, but it is wrong place to do it. Please keep the import peformance light.