Cannot create any visualization

[namankhator]

Every time I get this error:

No Compatible Fields: The "sample" index pattern does not contain any of the following field types: number, boolean, date, ip or string

This is my index.

Also, whenever I run:

curl 'localhost:9200/_cat/shards?h=index,shard,prirep,state,unassigned.reason'

Gives:

sample 1 p STARTED    
sample 1 r UNASSIGNED CLUSTER_RECOVERED
sample 4 p STARTED    
sample 4 r UNASSIGNED CLUSTER_RECOVERED
sample 3 p STARTED    
sample 3 r UNASSIGNED CLUSTER_RECOVERED
sample 2 p STARTED    
sample 2 r UNASSIGNED CLUSTER_RECOVERED
sample 0 p STARTED    
sample 0 r UNASSIGNED CLUSTER_RECOVERED
.kibana 0 p STARTED    
.kibana 0 r UNASSIGNED INDEX_CREATED

I have no idea what to do. I just started with ELK.
I have elasticsearch 5.4.1
Kibana 5.4
Please help

[Bargs (Matt Bargar)]

Fields aren't showing up in Visualize because none of your fields are listed as aggregatable. This might occur if you created the index pattern prior to adding any data to elasticsearch (could happen if you're using the sample beats dashboards). If you have data indexed now, could you try refreshing your field list (click the refresh button on that index pattern page).

If refreshing your field list doesn't fix the problem, do you see any errors in your ES or kibana logs when clicking that refresh button?

[namankhator]

I tried refreshing it, it gives error:

Field Capabilities: 5 of 5 shards failed

This is the error I get on the kibana dashboard.
Where do I check the logs?

[namankhator]

Done!
I had to delete my index and start from scratch.