Zend certified PHP/Magento developer

Magento Cloud reindex fail elasticsuite

I try to reindex my Magento Cloud and caught below error. Anyone whats wrong with the ElasticSuite

web@mymagento.0:~$ php bin/magento indexer:reindex
Design Config Grid index has been rebuilt successfully in 00:00:01
Customer Grid index has been rebuilt successfully in 00:00:01
Category Products index has been rebuilt successfully in 00:00:03
Product Categories index has been rebuilt successfully in 00:00:00
Catalog Rule Product index has been rebuilt successfully in 00:00:01
Product EAV index has been rebuilt successfully in 00:00:04
Stock index has been rebuilt successfully in 00:00:01
Inventory index has been rebuilt successfully in 00:00:00
Catalog Product Rule index has been rebuilt successfully in 00:00:00
Product/Target Rule index has been rebuilt successfully in 00:00:00
Target Rule/Product index has been rebuilt successfully in 00:00:00
Product Price index has been rebuilt successfully in 00:00:05
Google Product Removal Feed index has been rebuilt successfully in 00:00:00
Google Product Feed index has been rebuilt successfully in 00:00:00
Sales Rule index has been rebuilt successfully in 00:00:00
PHP Fatal error:  Uncaught Error: Wrong parameters for ElasticsearchCommonExce     ptionsServerErrorResponseException([string $message [, long $code [, Throwable      $previous = NULL]]]) in /app/vendor/elasticsearch/elasticsearch/src/Elasticsearc     h/Connections/Connection.php:682
Stack trace:
#0 /app/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connect     ion.php(682): Exception->__construct(NULL, 503)
#1 /app/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connect     ion.php(298): ElasticsearchConnectionsConnection->process5xxError(Array, Array     , Array)
#2 /app/vendor/react/promise/src/FulfilledPromise.php(25): ElasticsearchConnect     ionsConnection->ElasticsearchConnections{closure}(Array)
#3 /app/vendor/guzzlehttp/ringphp/src/Future/CompletedFutureValue.php(55): React     PromiseFulfilledPromise->then(Object(Closure), NULL, NULL)
#4 /app/vendor/guzzlehttp/ringphp/src/Core.php(341): GuzzleHttpRingFutureComp     letedFutureValue->then(Object(Closure), NULL, NULL)
#5 /app/vendor/elasticsearch/elasticsearch/src in /app/vendor/elasticsearch/elas     ticsearch/src/Elasticsearch/Connections/Connection.php on line 682

Fatal error: Uncaught Error: Wrong parameters for ElasticsearchCommonException     sServerErrorResponseException([string $message [, long $code [, Throwable $prev     ious = NULL]]]) in /app/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Con     nections/Connection.php:682
Stack trace:
#0 /app/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connect     ion.php(682): Exception->__construct(NULL, 503)
#1 /app/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connect     ion.php(298): ElasticsearchConnectionsConnection->process5xxError(Array, Array     , Array)
#2 /app/vendor/react/promise/src/FulfilledPromise.php(25): ElasticsearchConnect     ionsConnection->ElasticsearchConnections{closure}(Array)
#3 /app/vendor/guzzlehttp/ringphp/src/Future/CompletedFutureValue.php(55): React     PromiseFulfilledPromise->then(Object(Closure), NULL, NULL)
#4 /app/vendor/guzzlehttp/ringphp/src/Core.php(341): GuzzleHttpRingFutureComp     letedFutureValue->then(Object(Closure), NULL, NULL)
#5 /app/vendor/elasticsearch/elasticsearch/src in /app/vendor/elasticsearch/elas     ticsearch/src/Elasticsearch/Connections/Connection.php on line 682
web@mymagento.0:~$