title: Echarts - exclude series from tooltip
body: <p>I have a simple Echarts chart and want only the blue series to be focusable (the tooltip for the green chart should never show)
  The green series should only act as a visual indicator.</p>
  <p>Currently it behaves like this:
  <a href="https://i.stack.imgur.com/ToX15.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ToX15.png" alt="Example Echarts configuration" /></a></p>
  <p>I also made a small codesandbox to illustrate the problem:</p>
  <p><a href="https://codesandbox.io/s/tender-mclaren-o5zdq?fontsize=14&amp;hidenavigation=1&amp;theme=dark" rel="nofollow noreferrer"><img src="https://codesandbox.io/static/img/play-codesandbox.svg" alt="Edit tender-mclaren-o5zdq" /></a></p>