How to copy some ElasticSearch data to a new index - elasticsearch

Question

Let's say I have movie data in my ElasticSearch and I created them like this:
curl -XPUT "http://192.168.0.2:9200/movies/movie/1" -d'
{
"title": "The Godfather",
"director": "Francis Ford Coppola",
"year": 1972
}'
And I have a bunch of movies from different years. I want to copy all the movies from a particular year (so, 1972) and copy them to a new index of "70sMovies", but I couldn't see how to do that.

Answer 1

Since ElasticSearch 2.3 you can now use the built in _reindex API
for example:
POST /_reindex
{
"source": {
"index": "twitter"
},
"dest": {
"index": "new_twitter"
}
}
Or only a specific part by adding a filter/query
POST /_reindex
{
"source": {
"index": "twitter",
"query": {
"term": {
"user": "kimchy"
}
}
},
"dest": {
"index": "new_twitter"
}
}
Read more: https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-reindex.html

Answer 2

The best approach would be to use elasticsearch-dump tool https://github.com/taskrabbit/elasticsearch-dump.
The real world example I used :
elasticdump \
--input=http://localhost:9700/.kibana \
--output=http://localhost:9700/.kibana_read_only \
--type=mapping
elasticdump \
--input=http://localhost:9700/.kibana \
--output=http://localhost:9700/.kibana_read_only \
--type=data

Answer 3

Check out knapsack:
https://github.com/jprante/elasticsearch-knapsack
Once you have the plugin installed and working, you could export part of your index via query. For example:
curl -XPOST 'localhost:9200/test/test/_export' -d '{
"query" : {
"match" : {
"myfield" : "myvalue"
}
},
"fields" : [ "_parent", "_source" ]
}'
This will create a tarball with only your query results, which you can then import into another index.

Answer 4

To reindex specific type from source index to destination index type syntax is
POST _reindex/
{
"source": {
"index": "source_index",
"type": "source_type",
"query": {
// add filter criteria
}
},
"dest": {
"index": "dest_index",
"type": "dest_type"
}
}

Answer 5

If the intent were to copy some portion of the data or the entire data to an index with the same settings/mappings as that of the original index one could use the clone api to achieve the same. Something like below:
POST /<index>/_clone/<target-index>
OR
PUT /<index>/_clone/<target-index>
However if the intent is to copy the data to a new index with the different settings/mappings than the original index one could use the reindex api to achieve the same. Something like below:
POST _reindex/
{
"source": {
"index": "source_index",
"type": "source_type",
"query": {
// add filter criteria
}
},
"dest": {
"index": "dest_index",
"type": "dest_type"
}
}
*Note: In case of reindex api the target index has to be created prior to actual api call.
For further reading on difference between clone and reindex refer What's the difference between cloning and reindexing an index in Elasticsearch?

Answer 6

You can do it easily with elasticsearch-dump (https://github.com/taskrabbit/elasticsearch-dump) in three steps. In the following example I copy the index "thor" to "thor2"
elasticdump --input=http://localhost:9200/thor --output=http://localhost:9200/thor2 --type=analyzer
elasticdump --input=http://localhost:9200/thor --output=http://localhost:9200/thor2 --type=mapping
elasticdump --input=http://localhost:9200/thor --output=http://localhost:9200/thor2 --type=data

Answer 7

Well the straightforward way to do this is to write code, with the API of your choice, querying for "year": 1972 and then indexing that data into a new index. You would use the Search api or the Scan and Scroll API to get all the documents and then either index them one by one or use the Bulk Api:
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-search.html
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-scroll.html
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-index_.html
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-bulk.html
Assuming you don't want to do this via code but are looking for a direct way of doing this, I suggest the Elasticsearch Snapshot and Restore. Basically you would take a snapshot of your existing index, restore it into a new index and then use the Delete command to delete all documents with a year other than 1972.
Snapshot And Restore
The snapshot and restore module allows to create snapshots of
individual indices or an entire cluster into a remote repository. At
the time of the initial release only shared file system repository was
supported, but now a range of backends are available via officially
supported repository plugins.
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-snapshots.html
Delete By Query API
The delete by query API allows to delete documents from one or more
indices and one or more types based on a query. The query can either
be provided using a simple query string as a parameter, or using the
Query DSL defined within the request body.
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-delete-by-query.html

Answer 8

Since v7.4 the _clone api was introduced and can easily satisfy your need: (read for the relevant prerequisites and monitoring involved)
POST /<index>/_clone/<target-index>
Or:
PUT /<index>/_clone/<target-index>

Answer 9

You can use elasticdump --searchBody:
# Copy documents from movies to 70sMovies (filtering using query)
elasticdump \
--input=http://localhost:9200/movies \
--output=http://localhost:9200/70sMovies \
--type=data \
--searchBody="{\"query\":{\"term\":{\"username\": \"admin\"}}}" # <--- Your query here
more on elasticdump options here.