public RegionFactory<K, V> setIndexMaintenanceSynchronous(boolean synchronous) {
    attrsFactory.setIndexMaintenanceSynchronous(synchronous);
    return this;
  }
Sets how indexes on this region are kept current.

@param synchronous whether indexes are maintained in a synchronized fashion
@return a reference to this RegionFactory object
geode-core/src/main/java/org/apache/geode/cache/RegionFactory.java