[7.x] [ML] Transforms/Data Frame Analytics: Fix freezing wizard for indices with massive amounts of fields. (#98259) #98571
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… with massive amounts of fields. (elastic#98259) The transform wizard can become very slow when used with indices with e.g. 1000+ fields. This PR fixes it by prefetching 500 random documents to create a list of populated/used fields and passes those on to the data grid component instead of all available fields from the list derived via Kibana index patterns. For example, for an out of the box metricbeat index, this reduces the list of passed on fields from 3000+ to ~120 fields. Previously, the page would freeze on load for tens of seconds and would freeze again on every rerender. With the applied update, the page loads almost instantly again and remains responsive. Note this fix of reducing available fields is only applied to the data grid preview component. All fields are still available to create the configuration in the UI for groups and aggregations. These UI components, e.g. the virtualized dropdowns, can handle large lists of fields.
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Backports the following commits to 7.x: