[ML] The filter on the DF Analytics jobs UI does not always produce desired results

[Winterflower]

Kibana version:
STACK_VERSION=7.7.0
STACK_BUILD=12

Elasticsearch version:
STACK_VERSION=7.7.0
STACK_BUILD=12
Server OS version:

Browser version:
Chrome
Browser OS version:
Mac OS X
Original install method (e.g. download page, yum, from source, etc.):

Describe the bug:
I have created several jobs that have names like "class_8", "class_4" etc as well as other jobs. I'd like the jobs UI to only display jobs that have "class" somewhere. When I type "class" into the Filter bar, I unfortunately don't get any results (even though one can see from the unfiltered scenario that there are many jobs with the word "class" in the ID that could be returned)

Steps to reproduce:

1. Create multiple jobs
2. Try to filter a subset of the jobs that share some similarity - say part of the ID
3. If some of the jobs in the subset are in the state "analyzing", then the filter appears to work (see screenshot below).

Expected behavior:
Jobs UI shows only the jobs that match the query instead of an empty result table.

Screenshots (if relevant):

There are several jobs with the word "class" in the name

However filtering by "class" does not produce any results

The filter does appear to work sometimes, in particular if there are multiple jobs in "analyzing" state

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):

Any additional context:

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[peteharverson]

This looks like it is related to the paging of the jobs table. For example, if you run the search when on page 2, and the search matches less than 1 page worth of jobs, the table isn't resetting the page index back to the first page.