6.4 Reindex behaviour inconsistent with documentation

Elasticsearch version (bin/elasticsearch --version):

Version: 6.4.2, Build: default/tar/04711c2/2018-09-26T13:34:09.098244Z, JVM: 10.0.2

Plugins installed: []

JVM version (java -version):

java version "10.0.2" 2018-07-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode)

OS version (uname -a if on a Unix-like system):

Darwin C02WJ1HKG8WL 17.7.0 Darwin Kernel Version 17.7.0: Thu Jun 21 22:53:14 PDT 2018; root:xnu-4570.71.2~1/RELEASE_X86_64 x86_64

Description of the problem including expected versus actual behavior:

The document says

index and type in source can both be lists, allowing you to copy from lots of sources in one request.

However I got
Rejecting mapping update to [all_together] as the final mapping would have more than 1 type: [post, doc]

Steps to reproduce:

Please include a minimal but complete recreation of the problem, including
(e.g.) index creation, mappings, settings, query etc. The easier you make for
us to reproduce it, the more likely that somebody will take the time to look at it.

1. Create index twitter with type doc, and index blog with type post:

curl -X DELETE "localhost:9200/twitter?pretty"
curl -X DELETE "localhost:9200/blog?pretty"

curl -X POST "localhost:9200/_bulk?pretty" -H 'Content-Type: application/json' -d'
{ "index" : { "_index" : "twitter", "_type" : "doc", "_id" : "1" }}
{ "user" : "kimchi" }
{ "index" : { "_index" : "blog", "_type" : "post", "_id" : "2" }}
{ "title" : "hello world!" }

2. Reindex:

curl -X DELETE "localhost:9200/all_together?pretty"

curl -X POST "localhost:9200/_reindex?pretty" -H 'Content-Type: application/json' -d'
{
  "source": {
    "index": ["blog","twitter"],
    "type": ["post","doc"]
  },
  "dest": {
    "index": "all_together"
  }
}
'

Provide logs (if relevant):

{
  "took" : 865,
  "timed_out" : false,
  "total" : 2,
  "updated" : 0,
  "created" : 1,
  "deleted" : 0,
  "batches" : 1,
  "version_conflicts" : 0,
  "noops" : 0,
  "retries" : {
    "bulk" : 0,
    "search" : 0
  },
  "throttled_millis" : 0,
  "requests_per_second" : -1.0,
  "throttled_until_millis" : 0,
  "failures" : [
    {
      "index" : "all_together",
      "type" : "doc",
      "id" : "1",
      "cause" : {
        "type" : "illegal_argument_exception",
        "reason" : "Rejecting mapping update to [all_together] as the final mapping would have more than 1 type: [post, doc]"
      },
      "status" : 400
    }
  ]
}

[dadoonet]

I think you should do something like:

curl -X POST "localhost:9200/_reindex?pretty" -H 'Content-Type: application/json' -d'
{
"source": {
"index": ["blog","twitter"],
"type": ["post","doc"]
},
"dest": {
"index": "all_together",
"type": ["_doc"]
}
}
'

[wangzhenhui1992]

@fracting ES since 5.x does not the support multi types and maybe type will be removed in later version...

Thanks @dadoonet, adding "type": ["_doc"] or "type": "_doc" to dest doesn't work.
Thanks @wangzhenhui1992, I'm not relying on multi types feature, just try to help improving the documentation. Since it's not clear to me what's the expected behavior, I'll leave it to someone more experienced to fix the documentation.

[nik9000]

Yeah, this is busted. Let me see what I can do.