fix error when using bulk

[dobbbb]

Es 7.x:

1. using bulk api
2. type!='_ doc '
3. index match one template
   Will report an error, like this:
   Rejecting mapping update to [test_access] as the final mapping would have more than 1 type: [_doc, log]

[rockyluke]

We are also very interested by this PR, could you please take a look when you have time ?

Thanks!