Class cast exception while updating documents

[BlueSpirit (Aditya Gupta)]

While updating all documents in an index using _update_by_query I get the following error:

{
"error": {
"root_cause": [
{
"type": "class_cast_exception",
"reason": "java.lang.String incompatible with java.util.Map"
}
],
"type": "class_cast_exception",
"reason": "java.lang.String incompatible with java.util.Map"
},
"status": 500
}

Query executed was:

POST raw_requests_bib/_update_by_query
{
  "query": {
    "filtered": {
      "filter": {
        "bool": {
          "must": [
            {
              "term": {
                "user": "ba1"
              }
            }
          ]
        }
      }
    }
  },
  "script" : "ctx._source.user = BA1;"
}

My documents look like this:

{
"time": "12-12-2018--09-12-38",
"user": "ba1",
"url": "/page1"
}

Executed this on kibana devtools page.
I do not have access to elasticsearch logs for this. Any leads would be helpful.

[rjernst (Ryan Ernst)]

Without logs it will be difficult to investigate. We need the full stacktrace (which is printed in the log).

However, at a glance, what is BA1? If you mean this to be a string literal, it needs to be in quotes:

"script" : "ctx._source.user = 'BA1';"

[BlueSpirit (Aditya Gupta)]

Sorry for the late reply. I was able to get the logs from the server.

[2018-12-26T15:23:39,068][WARN ][r.suppressed ] path: /raw_requests_bib/_update_by_query, params: {index=raw_requests_bib}
java.lang.ClassCastException: java.lang.String incompatible with java.util.Map
at org.elasticsearch.index.reindex.RestUpdateByQueryAction.lambda$buildRequest$1(RestUpdateByQueryAction.java:65) ~[?:?]
at org.elasticsearch.index.reindex.RestUpdateByQueryAction$$Lambda$2051.000000002FC44C90.accept(Unknown Source) ~[?:?]
at org.elasticsearch.index.reindex.AbstractBulkByQueryRestHandler.extractRequestSpecificFields(AbstractBulkByQueryRestHandler.java:94) ~[?:?]
at org.elasticsearch.index.reindex.AbstractBulkByQueryRestHandler.parseInternalRequest(AbstractBulkByQueryRestHandler.java:57) ~[?:?]
at org.elasticsearch.index.reindex.RestUpdateByQueryAction.buildRequest(RestUpdateByQueryAction.java:67) ~[?:?]
at org.elasticsearch.index.reindex.RestUpdateByQueryAction.buildRequest(RestUpdateByQueryAction.java:41) ~[?:?]
at org.elasticsearch.index.reindex.AbstractBaseReindexRestHandler.doPrepareRequest(AbstractBaseReindexRestHandler.java:54) ~[?:?]
at org.elasticsearch.index.reindex.RestUpdateByQueryAction.prepareRequest(RestUpdateByQueryAction.java:50) ~[?:?]
at org.elasticsearch.rest.BaseRestHandler.handleRequest(BaseRestHandler.java:64) ~[elasticsearch-5.6.7.jar:5.6.7]
at org.elasticsearch.rest.RestController.dispatchRequest(RestController.java:262) ~[elasticsearch-5.6.7.jar:5.6.7]
at org.elasticsearch.rest.RestController.dispatchRequest(RestController.java:200) [elasticsearch-5.6.7.jar:5.6.7]
at org.elasticsearch.http.netty4.Netty4HttpServerTransport.dispatchRequest(Netty4HttpServerTransport.java:505) [transport-netty4-5.6.7.jar:5.6.7]
at org.elasticsearch.http.netty4.Netty4HttpRequestHandler.channelRead0(Netty4HttpRequestHandler.java:80) [transport-netty4-5.6.7.jar:5.6.7]
at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at org.elasticsearch.http.netty4.pipelining.HttpPipeliningHandler.channelRead(HttpPipeliningHandler.java:68) [transport-netty4-5.6.7.jar:5.6.7]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) [netty-codec-4.1.13.Final.jar:4.1.13.Final]
at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111) [netty-codec-4.1.13.Final.jar:4.1.13.Final]
....
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1334) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:926) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:134) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:544) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:498) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:458) [netty-transport-4.1.13.Final.jar:4.1.13.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) [netty-common-4.1.13.Final.jar:4.1.13.Final]
at java.lang.Thread.run(Thread.java:785) [?:1.8.0-internal]

Please let me know if this could be helped.

Also, tried "script" : "ctx._source.user = 'BA1';" but that did not help.