Enable RedistributeIndexes to be changed

The RedistributeIndexes value in the indexer settings can't be updated during a reconcile if the value is changing from true -> false. 

RedistributeIndexes isn't a pointer, and is a bool with omitempty. When the index settings are encoded, the field is removed from the request because isEmptyValue() returns true when the boolean value is false. A fix should be put in place so the value can be updated.

It's also worth checking this doesn't effect other settings trying to reconcile.

Steps taken

• Create a cluster with redistributeIndexes set to true in the spec
• Edit the cluster and set the field to false
• The reconcile will continually try and update the value but fail to do so