Modify Payment Indexes

Payment.java

@Entity
public class Payment extends ManagedEntity implements IManagedEntity
{
  @Attribute
  @Identifier
  protected long paymentId;

  @Relationship(type = RelationshipType.MANY_TO_ONE,
          inverse = "payments",
          inverseClass = Invoice.class)
  protected Invoice invoice;

  // Note, I have removed an index
  // @Index
  @Attribute
  protected double amount;

  // Note, I have added an index to notes
  @Attribute
  @Index
  protected String notes;
}