elasticsearch-php upsert 总是提示runtime error?

版本

Elasticsearchversion:5.1

Elasticsearch-phpversion:5.0

upsert

文档是：

array(6){["_index"]=>string(4)"demo"["_type"]=>string(4)"demo"["_id"]=>string(1)"1"["_version"]=>int(5)["found"]=>bool(true)["_source"]=>array(4){["a"]=>int(3)["b"]=>string(1)"a"["c"]=>string(1)"b"["d"]=>array(2){[0]=>string(1)"a"[1]=>string(1)"b"}}}

然后我执行下面的代码：

require_once'./vendor/autoload.php';$client=Elasticsearch\ClientBuilder::create();$client->setHosts(['127.0.0.1']);$client=$client->build();print_r($client->update(['index'=>'demo','type'=>'demo','id'=>1,'body'=>['script'=>'ctx._source.counter+=4','params'=>['count'=>4],'upsert'=>['counter'=>1]]]));

提示我：

Fatalerror:UncaughtElasticsearch\Common\Exceptions\BadRequest400Exception:{"error":{"root_cause":[{"type":"remote_transport_exception","reason":"[shcGs0R][127.0.0.1:9300][indices:data/write/update[s]]"}],"type":"illegal_argument_exception","reason":"failedtoexecutescript","caused_by":{"type":"script_exception","reason":"runtimeerror","caused_by":{"type":"null_pointer_exception","reason":null},"script_stack":["ctx._source.counter+=4","^----HERE"],"script":"ctx._source.counter+=4","lang":"painless"}},"status":400}

print_r($client->update(['index'=>'demo','type'=>'demo','id'=>1,'body'=>['script'=>'ctx._source.a+=params.count','params'=>['count'=>4],]]));

这个也提示这个错误：

Fatalerror:UncaughtElasticsearch\Common\Exceptions\BadRequest400Exception:{"error":{"root_cause":[{"type":"remote_transport_exception","reason":"[shcGs0R][127.0.0.1:9300][indices:data/write/update[s]]"}],"type":"illegal_argument_exception","reason":"failedtoexecutescript","caused_by":{"type":"script_exception","reason":"runtimeerror","caused_by":{"type":"null_pointer_exception","reason":null},"script_stack":["ctx._source.a+=params.count","^----HERE"],"script":"ctx._source.a+=params.count","lang":"painless"}},"status":400}