I read the documentation on Time Series visualization that it can create multiple series by field in the same index.
However, I want to create a line chart with several series that distinguished by index e.g. green line with actual-index and red line with forecast-index.
in the panel settings of time series visual builder you can override the index pattern. you can even set it to * (to look at all index patterns). the only requirement is that all your index patterns have the same time field (for example @timestamp).
then you can plot metrics on fields from different indexes.
you could also do the same using timelion, without the restriction of same time field:
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