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### One-line summary [问题简述]
Since selecting a legend category seems to change a graph node's `dataIndex`, I
would like to be able to access a node's `dataIndex` by its ID.
### Version & Environment [版本及环境]
+ ECharts version [ECharts 版本]: eCharts 4.2.0-rc1
+ Browser version [浏览器类型和版本]: Google Chrome 69
+ OS Version [操作系统类型和版本]: Mac OS X 10.14 Mojave
### Expected behaviour [期望结果]
I have found a `getNodeById` function in the source code, which is the sort of
thing I would like to have--find a node's `dataIndex` based on its ID. But I
can't figure out a way to use this functionality in my code.
### ECharts option [ECharts配置项]
<!-- Copy and paste your 'echarts option' here. -->
<!-- [下方贴你的option，注意不要删掉下方 ```javascript 和 尾部的 ``` 字样。最好是我们能够直接运行的
option。如何得到能运行的 option 参见上方的 guidelines for contributing] -->
```javascript
option = {
title: {
text: 'Document Reuse',
subtext: 'Default layout',
top: 'bottom',
left: 'right'
},
tooltip: {},
legend: [{
data: categories.map(function(category) {
return category.name;
})
}],
animationDuration: 1500,
animationEasingUpdate: 'quinticInOut',
series: [{
name: 'All Links',
type: 'graph',
layout: 'none',
data: graph.nodes,
links: graph.links,
categories: categories,
roam: true,
focusNodeAdjacency: true,
itemStyle: {
normal: {
borderColor: '#fff',
borderWidth: 1,
shadowBlur: 10,
shadowColor: 'rgba(0, 0, 0, 0.3)'
}
},
label: {
position: 'right',
formatter: '{b}'
},
lineStyle: {
color: 'source',
curveness: 0.3
},
emphasis: {
lineStyle: {
width: 10
}
}
}]
};
```
### Other comments [其他信息]
<!-- For example: Screenshot or Online demo -->
<!-- [例如，截图或线上实例 (JSFiddle/JSBin/Codepen)] -->
[ Full content available at:
https://github.com/apache/incubator-echarts/issues/9161 ]
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