Prior to this commit (and after 6.5.0), if an ingest node changes
the _index in a pipeline, the original target index would be created.
For daily indexes this could create an extra, empty index per day.

This commit changes the TransportBulkAction to execute the ingest node
pipeline before attempting to create the index. This ensures that the 
only index created is the original or one set by the ingest node pipeline. 
This was the execution order prior to 6.5.0 (elastic#32786). 

The execution order was changed in 6.5 to better support default pipelines. 
Specifically the execution order was changed to be able to read the settings
from the index meta data. This commit also includes a change in logic such 
that if the target index does not exist when ingest node pipeline runs, it 
will now pull the default pipeline (if one exists) from the settings of the 
best matched of the index template. 

Relates elastic#32786
Relates elastic#32758 
Closes elastic#36545