with the high-level client in the version 5.6 but I get this compilation error at this point:
...
RestHighLevelClient rHLClient
...
BulkProcessor bulkProcessor = BulkProcessor.builder(rHLClient::bulkAsync, listener,threadPool).build();
"Client is not a functional interface"
If there is a better way to use that, please advise. I've been blocked on it.
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