@ModuleOption("the name of the field to use as the identity in MongoDB")
	public void setIdField(String idField) {
		this.idField = idField;
	}
Options for Hdfs to Mongodb export job module.

@author Ilayaperumal Gopinathan
@author Thomas Risberg
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/modules/metadata/HdfsMongodbJobOptionsMetadata.java