ExecutePainlessScriptRequest
public class ExecutePainlessScriptRequest : PlainRequestBase<ExecutePainlessScriptRequestParameters>, IExecutePainlessScriptRequest, IRequest<ExecutePainlessScriptRequestParameters>, IRequest
Request for ExecutePainlessScript
https://www.elastic.co/guide/en/elasticsearch/painless/master/painless-execute-api.html
public ExecutePainlessScriptRequest()