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reindex-from-snapshot

How to run

Set up your ES 6.8 Source Cluster

git clone git@github.com:elastic/elasticsearch.git
git checkout 6.8

Open up IntelliJ and load the root directory. Then follow these instructions to run Elasticsearch from source w/ the debugger attached.

Then, you can run some commands to set up some test indices/snapshot:

curl -u "elastic-admin:elastic-password" -X PUT "localhost:9200/_template/posts_index_template" -H "Content-Type: application/json" -d'
{
    "index_patterns": ["posts_*"],
    "settings": {
        "number_of_shards": 1,
        "number_of_replicas": 1
    },
    "mappings": {
        "_doc": {
            "properties": {
                "contents": {"type": "text"},
                "author": {"type": "keyword"},
                "tags": {"type": "keyword"}
            }
        }
    },
    "aliases": {
        "alias1": {},
        "alias2": {
            "filter": {
                "term": {"user": "kimchy"}
            },
            "routing": "kimchy"
        },
        "{index}-alias": {}
    }
}'

curl -u "elastic-admin:elastic-password" -X PUT "localhost:9200/posts_2023_02_25"

curl -u "elastic-admin:elastic-password" -X POST "localhost:9200/posts_2023_02_25/_doc" -H "Content-Type: application/json" -d'
{
  "contents": "This is a sample blog post content.",
  "author": "Author Name",
  "tags": ["Elasticsearch", "Tutorial"]
}'

curl -u "elastic-admin:elastic-password" -X PUT "localhost:9200/posts_2024_01_01" -H "Content-Type: application/json" -d'
{
  "aliases": {
    "another_alias": {
      "routing": "user123",
      "filter": {
        "term": {
          "author": "Tobias Funke"
        }
      }
    }
  }
}'

curl -u "elastic-admin:elastic-password" -X POST "localhost:9200/another_alias/_doc" -H "Content-Type: application/json" -d'
{
  "contents": "How Elasticsearch helped my patients",
  "author": "Tobias Funke",
  "tags": ["Elasticsearch", "Tutorial"]
}'

curl -u "elastic-admin:elastic-password" -X POST "localhost:9200/another_alias/_doc" -H "Content-Type: application/json" -d'
{
  "contents": "My Time in the Blue Man Group",
  "author": "Tobias Funke",
  "tags": ["Lifestyle"]
}'

curl -X PUT "localhost:9200/_snapshot/fs_repository" -u "elastic-admin:elastic-password" -H "Content-Type: application/json" -d'
{
  "type": "fs",
  "settings": {
    "location": "/Users/chelma/workspace/ElasticSearch/elasticsearch/distribution/build/cluster/shared/repo"
  }
}'

curl -X PUT "localhost:9200/_snapshot/fs_repository/global_state_snapshot?wait_for_completion=true" -u "elastic-admin:elastic-password"  -H "Content-Type: application/json" -d'
{
  "indices": ["posts_2023_02_25", "posts_2024_01_01"],
  "ignore_unavailable": true,
  "include_global_state": true
}'

Set up your OS 2.11 Target Cluster

I've only tested the scripts going from ES 6.8 to OS 2.11. For my test target, I just spun up an Amazon OpenSearch Service 2.11 cluster with a master user/password combo and otherwise default settings.

Run the scripts

I've been running them VS Code integration, but you should be able to do it using their dedicated gradle commands as well. That would look something like:

SNAPSHOT_DIR=/Users/chelma/workspace/ElasticSearch/elasticsearch/distribution/build/cluster/shared/repo
LUCENE_DIR=/tmp/lucene_files
HOSTNAME=<Amazon OpenSearch Domain URL>
USERNAME=<Amazon OpenSearch Domain master user name>
PASSWORD=<Amazon OpenSearch Domain master password>

gradle build

gradle run --args='-n global_state_snapshot --snapshot-dir $SNAPSHOT_DIR -l $LUCENE_DIR -h $HOSTNAME  -u $USERNAME -p $PASSWORD -s es_6_8 -t os_2_11 --movement-type everything'