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elasticsearch_best_practice.md

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Check cluster health

$ curl elasticsearch:9200/_cluster/health?pretty

List all index

$ curl <elastic_host>/_cat/indices?v

Identifying cluster problem

$ curl <elastic_host>/_cluster/allocation/explain?pretty

Fix cannot allocate because allocation is not permitted to any of the nodes issue

$ curl -X PUT \
    -H 'Content-Type: application/json' \
    -d '{ "index" : { "number_of_replicas": 0 } }' \
    <elastic_host>/<index_name>/_settings

Reroute failed shards

The safer way

$ curl -X POST '<elastic_host>/_cluster/reroute?retry_failed'

Reroute specific index

$ curl -X POST \
    -H 'Content-Type: application/json' \
    -d '{ "commands" : [ { "allocate_stale_primary" : { "index" : "<index_name>", "shard" : 5, "node" : "0", "accept_data_loss" : true } } ] }' \
    'localhost:9200/_cluster/reroute?pretty'