Field Path
The field path is the hierarchy of the field, which is the path where you can find the field. To configure filters or display patterns, you must access the value via field ID or field path. The field path always starts in lowercase.
layerId.fieldId
You can open Schemas > Indexing. There, you find the field path of every field of the schema. To copy it. click on the value.
Visual representation of the hierarchy of the field path syntax
productInformation.products
descriptiveKeyword.keywords
multimediaInformation.sources
You can open the Display Pattern Editor to see the JSON of a Content Item.