Markss the caption as default and removes that mark from all other caption assets of the entry.
null
object responseProfile:object:KalturaBaseResponseProfile
abstract
objectType:string Enum: KalturaDetachedResponseProfile, KalturaResponseProfileHolder, KalturaResponseProfileKalturaBaseResponseProfile must also match any of:
object:KalturaDetachedResponseProfile object:KalturaResponseProfileHolder object:KalturaResponseProfile