This writer hit an unrecoverable error; cannot merge

Elastic Stack Elasticsearch
1

Elasticsearch version : 6.1.1

mapping => 
    "_routing" : {
       "required" : true
    }
    "join_field" : {
        "type" : "join",
        "eager_global_ordinals": true,
        "relations": {
              "questions" : "answer"
         }
     }

INPUT

    curl -XPOST localhost:9200/_bulk -H "Content-Type: application/json" -d'
{"index":{"_index":"example-v6","_type":"doc","_id":"wq_3050","routing":"questions"}}
{"type":0,"id-num":3050,"title":"elastic testing","suggest":{"input":"....test..."},"content":"ah......","directory":1,"analyzed-type":13,"location-list":[],"written-date-time":"2020.04.01 16:06:14","view-count":0,"is-deleted":false,"answer-count":0,"join_field":{"name":"question"},"adopted-date-time":null}

{"index":{"_index":"example-v6","_type":"doc","_id":"wqa_3672","routing":"questions"}}
{"type":1,"id-num":3672,"content":"en.....","written-date-time":"2020.04.01 16:07:36","is-deleted":false,"coment-count":0,"like-count":0,"join_field":{"name":"answer","parent":"wq_3050"}}'

OUTPUT

[2020-04-01T16:17:07,650][ERROR][o.e.i.e.InternalEngine$EngineMergeScheduler] [q0h0YFO] [example-v6][4] failed to merge
java.lang.IllegalStateException: this writer hit an unrecoverable error; cannot merge
	at org.apache.lucene.index.IndexWriter._mergeInit(IndexWriter.java:4193) ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 - ubuntu - 2017-10-13 16:12:42]
	at org.apache.lucene.index.IndexWriter.mergeInit(IndexWriter.java:4173) ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 - ubuntu - 2017-10-13 16:12:42]
	at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4026) ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 - ubuntu - 2017-10-13 16:12:42]
	at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:624) ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 - ubuntu - 2017-10-13 16:12:42]
	at org.elasticsearch.index.engine.ElasticsearchConcurrentMergeScheduler.doMerge(ElasticsearchConcurrentMergeScheduler.java:99) ~[elasticsearch-6.1.1.jar:6.1.1]
	at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:661) ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 - ubuntu - 2017-10-13 16:12:42]
Caused by: java.lang.IllegalStateException: found existing value for PerFieldPostingsFormat.format, field=join_field#answer, old=Lucene50, new=Lucene50
	at org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$FieldsWriter.buildFieldsGroupMapping(PerFieldPostingsFormat.java:226) ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 - ubuntu - 2017-10-13 16:12:42]
	at org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$FieldsWriter.merge(PerFieldPostingsFormat.java:152) ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 - ubuntu - 2017-10-13 16:12:42]
	at org.apache.lucene.index.SegmentMerger.mergeTerms(SegmentMerger.java:230) ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 - ubuntu - 2017-10-13 16:12:42]
	at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:115) ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 - ubuntu - 2017-10-13 16:12:42]
	at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4392) ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 - ubuntu - 2017-10-13 16:12:42]
	at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4032) ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 - ubuntu - 2017-10-13 16:12:42]
	... 3 more

1. answer and question are looking at the same routing.
2. answer parent is pointing at question _id.

if I set unique _id to each question to routing, it works well.

ex)

{"index":{"_index":"example-v6","_type":"doc","_id":"wq_3050","routing":"wq_3050"}}
{"type":0,"id-num":3050,"title":"elastic testing","suggest":{"input":"....test..."},"content":"ah......","directory":1,"analyzed-type":13,"location-list":[],"written-date-time":"2020.04.01 16:06:14","view-count":0,"is-deleted":false,"answer-count":0,"join_field":{"name":"question"},"adopted-date-time":null}

{"index":{"_index":"example-v6","_type":"doc","_id":"wqa_3672","routing":"wqa_3672"}}
{"type":1,"id-num":3672,"content":"dk.....","written-date-time":"2020.04.01 16:07:36","is-deleted":false,"coment-count":0,"like-count":0,"join_field":{"name":"answer","parent":"wq_3050"}}'

HELP ME!!!

2

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