Attachment Indexing search

i have indexed attachments using ingest-attachment processor and in search i want only mail nested Attachment but when i'm trying to search on attachment content it returns complete Document

/---------------------------------------------
Class Mail
{
String MailId {get;set;}
String DataBase64 {get;set}
[nested]
List{get;set;}

}

Class Attachments
{
public Nest.Attachment attachment { get; set; }
}
/----------------------------------------------------------------------------------

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