Updated ElasticsearchPublisher in publisher.py to support current version of elasticsearch while maintaining backwards compatibility to previous versions as well. Tested on multiple versions of elasticsearch
Updated ElasticsearchPublisher in publisher.py to support current version of elasticsearch while maintaining backwards compatibility to previous versions as well. Tested on multiple versions of elasticsearch

GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker