[Before]:

Where:

  in Supply or Delivery(Sale Order, Sale Packing List,..)

When:

( document.edit(something=some_value)

  OR

  document.validate(), document.start() something when workflow transition  )

AND

  document contains more than 100 sub objects, like 100 lines.

Then:
  /some_module/document/1/recursiveImmediateReindexObject
  /some_module/document/1/reindexObject
  /some_module/document/1/1/recursiveImmediateReindexObject
  .
  .
  /some_module/document/1/100/recursiveImmediateReindexObject

are triggered.

The first big recursiveImmediateReindexObject recursively reindex all the sub
objects. Thus the following reindex are duplicated.

[After]:

Reindex:
  /some_module/document/1/reindexObject
  /some_module/document/1/1/recursiveImmediateReindexObject
  .
  .
  /some_module/document/1/100/recursiveImmediateReindexObject

The root recursiveImmediateReindexObject is removed.

This has been the expected behavior from the beginning.
Before was only a side effect by giving empty dict to "if activate_kw == None"
expression.