It seems clear to me that I'm obviously misunderstanding how filters are used in Kibana's visualizations and/or am using them incorrectly.
Brief background. Each document contains a unique identifier and let's say two additional fields
I create a Y axis and use a unique count of the unique identifier (which really I suppose wouldn't have to be unique).
I then create buckets and split series as per below screenshot
The 'infectious contact'.keyword field can take the following values
or it can be blank, meaning it's missing.
I thought I could create the above visualization and add a filter along the lines of:
to display only those that have a value of No recorded in this field but as soon as I do, this removes any and all lines in the graph, see screenshot below
Is what I'm trying to do not possible or am I using the split series and Filter operator the wrong way?
Again, I know the above is a relatively poor explanation but I hope someone is able to make sense of it and please offer some help. In this scenario what I was hoping would show would be, for each LHD for the time period in question, show a line indicating the number of "No" responses . I would then hope to do the same with another split series and with a filter for the number of Yes responses.
Thanks for any and all help, it's much appreciated.