Reindexing using Java Client - What happens when one or both of the index do not exist

Elastic Stack Elasticsearch
1

What happens when one or both of the index do not exist if we do reindexing using Java Client? When I tested on local, it completes successfully without throwing exception.

How does one test if an index already exists or not?

I am new to Elasticsearch, any help would be really appreciated. Thanks :wave:

2

Welcome!

What does your code look like?

1 Like
3

I am using the RestHighLevelClient from ES Java REST Client to call the reindex method. I can see after the reindex that the total number of documents proccessed using the BulkScrollByResponse.getTotal().

4

Could you share the piece of code you are using please?

What is your elasticsearch version?

By the way, you should now switch to the new official Java Client.

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5

This is the skeleton code of what I am doing:

try {
    ReindexRequest request = new ReindexRequest().setSourceIndices(sourceIndex).setDestIndex(desIndex);
    BulkByScrollResponse response = restHighLevelClient.reindex(request, RequestOptions.DEFAULT);
} catch (Exception ex) {
    // do stuff
}

I except to get an exception if either of the indices targetIndex and/or sourceIndex are invalid/don't exist.

6

You did not tell which version you are using, but with a simple test on 8.8 in Kibana dev console:

POST /_reindex
{
  "source": {
    "index": "doesnotexist"
  },
  "dest": {
    "index": "foo"
  }
}

I'm getting a 404 error:

{
  "error": {
    "root_cause": [
      {
        "type": "index_not_found_exception",
        "reason": "no such index [doesnotexist]",
        "resource.type": "index_or_alias",
        "resource.id": "doesnotexist",
        "index_uuid": "_na_",
        "index": "doesnotexist"
      }
    ],
    "type": "index_not_found_exception",
    "reason": "no such index [doesnotexist]",
    "resource.type": "index_or_alias",
    "resource.id": "doesnotexist",
    "index_uuid": "_na_",
    "index": "doesnotexist"
  },
  "status": 404
}

I'd expect the same to happen in the Java Client. I just checked it with the new java client:

try {
  client.reindex(rr -> rr.source(s -> s.index("does-not-exists")).dest(d -> d.index("foo")));
} catch (ElasticsearchException e) {
  logger.info("Got error {}", e.response());
}

This gives:

12:05:21,952 INFO  [f.p.t.e.h.EsClientIT] Got error ErrorResponse: {"error":{"index_uuid":"_na_","index":"does-not-exists","resource.type":"index_or_alias","resource.id":"does-not-exists","type":"index_not_found_exception","reason":"no such index [does-not-exists]","root_cause":[{"index_uuid":"_na_","index":"does-not-exists","resource.type":"index_or_alias","resource.id":"does-not-exists","type":"index_not_found_exception","reason":"no such index [does-not-exists]"}]},"status":404}
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7

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