SP.Taxonomy.LabelMatchInformation.defaultLabelOnly property (sp.taxonomy)
Indicates whether only default labels should be matched against in the search.
Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013
var value = SP.Taxonomy.LabelMatchInformation.get_defaultLabelOnly()
SP.Taxonomy.LabelMatchInformation.set_defaultLabelOnly(a)