[Graph] Drilldown links do not select the correct index pattern

[elasticmachine]

Original comment by @marius-dr:

Kibana version: 6.1.0

Browser version: Firefox 57

Original Kibana install method (e.g. download page, yum, from source, etc.): BC5

Original X-Pack install method (e.g. by name, offline install, from source, etc.): BC5

Description of the problem including expected versus actual behavior:
If you use the drilldown links to the Raw document on one of the nodes, the link that opens does not select the correct index pattern. Instead of the selected index pattern, it seems to select the first index pattern from the dropdown list.

Steps to reproduce:

1. Create 2 index patterns. (in my example metricbeat and the makelogs data)
2. Create a graph using the last created index pattern (makelogs data in my case)
3. Select one of the vertices and open the drilldown link to the Raw document. The URL that opens contains the first index pattern in it (so, for the example it will be metricbeat).

Might be related to: LINK REDACTED @spalger

[LeeDr]

@marius-dr could you please check this on 6.6.0? I'm trying but not sure how you drilldown to the Raw document. Do I have to configure something here?

[flash1293]

@LeeDr You have to select a node and press the "i" icon in the panel to right next to the pause button. Then you can select the drilldown link below.

I reproduced the bug - the drilldown template only get initialized once and doesn't register the update of the index pattern. Working on a fix.