Run `POST _reindex` to reindex from multiple sources. The `index` attribute in source can be a list, which enables you to copy from lots of sources in one request. This example copies documents from the `my-index-000001` and `my-index-000002` indices.
{
"source": {
"index": ["my-index-000001", "my-index-000002"]
},
"dest": {
"index": "my-new-index-000002"
}
}
You can use Painless to reindex daily indices to apply a new template to the existing documents. The script extracts the date from the index name and creates a new index with `-1` appended. For example, all data from `metricbeat-2016.05.31` will be reindexed into `metricbeat-2016.05.31-1`.
{
"source": {
"index": "metricbeat-*"
},
"dest": {
"index": "metricbeat"
},
"script": {
"lang": "painless",
"source": "ctx._index = 'metricbeat-' + (ctx._index.substring('metricbeat-'.length(), ctx._index.length())) + '-1'"
}
}
Run `POST _reindex` to extract a random subset of the source for testing. You might need to adjust the `min_score` value depending on the relative amount of data extracted from source.
{
"max_docs": 10,
"source": {
"index": "my-index-000001",
"query": {
"function_score" : {
"random_score" : {},
"min_score" : 0.9
}
}
},
"dest": {
"index": "my-new-index-000001"
}
}
Run `POST _reindex` to modify documents during reindexing. This example bumps the version of the source document.
{
"source": {
"index": "my-index-000001"
},
"dest": {
"index": "my-new-index-000001",
"version_type": "external"
},
"script": {
"source": "if (ctx._source.foo == 'bar') {ctx._version++; ctx._source.remove('foo')}",
"lang": "painless"
}
}
When using Elastic Cloud, you can run `POST _reindex` and authenticate against a remote cluster with an API key.
{
"source": {
"remote": {
"host": "http://otherhost:9200",
"username": "user",
"password": "pass"
},
"index": "my-index-000001",
"query": {
"match": {
"test": "data"
}
}
},
"dest": {
"index": "my-new-index-000001"
}
}
Run `POST _reindex` to slice a reindex request manually. Provide a slice ID and total number of slices to each request.
{
"source": {
"index": "my-index-000001",
"slice": {
"id": 0,
"max": 2
}
},
"dest": {
"index": "my-new-index-000001"
}
}
Run `POST _reindex?slices=5&refresh` to automatically parallelize using sliced scroll to slice on `_id`. The `slices` parameter specifies the number of slices to use.
{
"source": {
"index": "my-index-000001"
},
"dest": {
"index": "my-new-index-000001"
}
}
By default if reindex sees a document with routing then the routing is preserved unless it's changed by the script. You can set `routing` on the `dest` request to change this behavior. In this example, run `POST _reindex` to copy all documents from the `source` with the company name `cat` into the `dest` with routing set to `cat`.
{
"source": {
"index": "source",
"query": {
"match": {
"company": "cat"
}
}
},
"dest": {
"index": "dest",
"routing": "=cat"
}
}
Run `POST _reindex` and use the ingest pipelines feature.
{
"source": {
"index": "source"
},
"dest": {
"index": "dest",
"pipeline": "some_ingest_pipeline"
}
}
Run `POST _reindex` and add a query to the `source` to limit the documents to reindex. For example, this request copies documents into `my-new-index-000001` only if they have a `user.id` of `kimchy`.
{
"source": {
"index": "my-index-000001",
"query": {
"term": {
"user.id": "kimchy"
}
}
},
"dest": {
"index": "my-new-index-000001"
}
}
You can limit the number of processed documents by setting `max_docs`. For example, run `POST _reindex` to copy a single document from `my-index-000001` to `my-new-index-000001`.
{
"max_docs": 1,
"source": {
"index": "my-index-000001"
},
"dest": {
"index": "my-new-index-000001"
}
}
You can use source filtering to reindex a subset of the fields in the original documents. For example, run `POST _reindex` the reindex only the `user.id` and `_doc` fields of each document.
{
"source": {
"index": "my-index-000001",
"_source": ["user.id", "_doc"]
},
"dest": {
"index": "my-new-index-000001"
}
}
A reindex operation can build a copy of an index with renamed fields. If your index has documents with `text` and `flag` fields, you can change the latter field name to `tag` during the reindex.
{
"source": {
"index": "my-index-000001"
},
"dest": {
"index": "my-new-index-000001"
},
"script": {
"source": "ctx._source.tag = ctx._source.remove(\"flag\")"
}
}
