spring - How to remove unique index on nested Object in Mongo -

i using spring boot 2.0.0.m3. , have following object structure:

@document(collections="note") public class note {    string id;    @indexed(background=true,unique=true)    string requestid; }  @document(collection="noteexpression") public class noteexpression {   public static class error {     private datetime datetime = datetime.now();     private note note;     private string exception;   }   string id;   //some other fields   error error; } 

in object of noteexpression, need store error information when unexpected occurs. seems fine. problem mongo create unique index nested property note in noteexpression.error.

see result of mongo command below:

>db.noteexpression.getindexes() [     {         "v" : 2,         "key" : {             "_id" : 1         },         "name" : "_id_",         "ns" : "test.noteexpression"     },     {         "v" : 2,         "unique" : true,         "key" : {             "errors.note.requestid" : 1         },         "name" : "errors.note.requestid",         "ns" : "test.noteexpression",         "background" : true     } ] 

unique index requestid on documents of note necessary in system, don't want unique index on documents of noteexpression. there way avoid creating index on noteexpression?