我已经使用https://www.elastic.co/guide/en/elasticsearch/client/java-rest/6.6/java-rest-high-document-multi-term-vectors.html实现了多向量API（第二种方法） 低于异常
<html>
<head><title>400 Bad Request</title></head>
<body bgcolor="white">
<center><h1>400 Bad Request</h1></center>
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ResponseException[method [GET], host [https://search-pfs-test-2a3ks4cmgp56ks7mnyoozwitlm.us-east-2.es.amazonaws.com], URI [_mtermvectors], status line [HTTP/1.1 400 Bad Request]
at org.elasticsearch.client.RestClient$1.completed(RestClient.java:548) ~[elasticsearch-rest-client-6.6.0.jar:6.6.0]
at org.elasticsearch.client.RestClient$1.completed(RestClient.java:533) ~[elasticsearch-rest-client-6.6.0.jar:6.6.0]
at org.apache.http.concurrent.BasicFuture.completed(BasicFuture.java:123) ~[httpcore-4.4.8.jar:4.4.8]
at org.apache.http.impl.nio.client.DefaultClientExchangeHandlerImpl.responseCompleted(DefaultClientExchangeHandlerImpl.java:181) ~[httpasyncclient-4.1.3.jar:4.1.3]
at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.processResponse(HttpAsyncRequestExecutor.java:436) ~[httpcore-nio-4.4.5.jar:4.4.5]
at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.inputReady(HttpAsyncRequestExecutor.java:326) ~[httpcore-nio-4.4.5.jar:4.4.5]
at org.apache.http.impl.nio.DefaultNHttpClientConnection.consumeInput(DefaultNHttpClientConnection.java:265) ~[httpcore-nio-4.4.5.jar:4.4.5]
at org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:81) ~[httpasyncclient-4.1.3.jar:4.1.3]
at org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:39) ~[httpasyncclient-4.1.3.jar:4.1.3]
at org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODispatch.java:121) ~[httpcore-nio-4.4.5.jar:4.4.5]
at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:162) ~[httpcore-nio-4.4.5.jar:4.4.5]
at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:337) ~[httpcore-nio-4.4.5.jar:4.4.5]
at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:315) ~[httpcore-nio-4.4.5.jar:4.4.5]
at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:276) ~[httpcore-nio-4.4.5.jar:4.4.5]
at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104) ~[httpcore-nio-4.4.5.jar:4.4.5]
at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:588) ~[httpcore-nio-4.4.5.jar:4.4.5]
at java.lang.Thread.run(Unknown Source) [na:1.8.0_161]
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