message: Make HitsList item key more unique
  Prevent errors in case when `$all` `_index` has results with same `_id`
diff: @@ -70,7 +70,7 @@ export class HitsList extends React.PureComponent<HitsListProps, any>{
  <div data-qa="hits" className={bemBlocks.container().mix(className)}>
  {map(hits, (result: any, index)=> {
  return renderComponent(itemComponent, {
  - key:result._id, result, bemBlocks, index
  + key: `${result._id}_${result._index}`, result, bemBlocks, index
  })
  })}
  </div>
  