What is the default `routing` parameter for Elasticsearch's bulk api?

Question

From the elastic docs:

The default value used for _routing is the document’s _id (regarding PUT api)

But I could not find any default value for bulk api documentation

Should I set _routing mapping manually or is there a default value?

Answer 1

You need to provide the routing value in each command line

                                                 here
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                                                   v
{ "index" : { "_index" : "test", "_id" : "1", "_routing": 123 } }
{ "field1" : "value1" }