https://developers.google.cn/workspace/cloud-search/docs/reference/sdk/com/google/enterprise/cloudsearch/sdk/BatchRequestService
BatchRequestService | Cloud Search | Google for Developers
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https://developers.google.com/workspace/cloud-search/docs/reference/sdk/com/google/enterprise/cloudsearch/sdk/BatchRequestService.ExecutorFactory
BatchRequestService.ExecutorFactory | Cloud Search | Google for Developers
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