Fix type: `function_score` can also be `QueryDslFunctionScoreContainer`

[ohueter]

trafficstars

This PR changes the function_score type in the QueryDslQueryContainer interface from

interface QueryDslQueryContainer {
  function_score?: QueryDslFunctionScoreQuery
}

to

interface QueryDslQueryContainer {
  function_score?: QueryDslFunctionScoreQuery | QueryDslFunctionScoreContainer
}

I'm not sure if any additional files need to be changed or code needs to be auto-generated? Would appreciate your help, thanks!

Fixes #1744

Update: Signed the contributor agreement.

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[cla-checker-service[bot]]

💚 CLA has been signed