Index already exists exception

Hi,

We define some indices in the xml file, like the following

<gfe:index id="eticket_id_number_index" cache-ref="cache"
  expression="i.value.id_number" from="/Eticket.entrySet i" type="FUNCTIONAL"
  override="true" />

But when we start some data stores at the same time, i.e., 4 nodes in 1 physical machine, in total 2 machines, we often encoutered the index already exists exception, even we specifed the attribute override = true.

We wonder if this is a bug in Spring Gemfire 1.2.1 with Gemfire 6.6.3.