Basics of using Elasticsearch

To see the available indices:

curl 'localhost:9200/_cat/indices?v'

Some more example for seeing Logstash indices:

curl -XGET 'http://localhost:9200/_mapping'
curl -XGET 'http://localhost:9200/logstash-*/log/_mapping'
curl -XGET 'http://localhost:9200/logstash-2015.01.08/_search?q=_type:logs&pretty=1'
curl -XGET 'http://localhost:9200/logstash-2015.01.08/_search?q=type:syslog&pretty=1'
curl -XGET 'http://localhost:9200/logstash-2015.01.08/syslog/_search?q=type:syslog&pretty=1'
curl -XGET 'http://localhost:9200/logstash-2015.01.12/loadbalancer/_search?q=tags:_grokparsefailure&pretty=1'

Deleting indices by name or based on query:

curl -XDELETE 'http://localhost:9200/index_name/'
curl -XDELETE 'http://localhost:9200/logstash-*/_query?q=facility_label:user-level&pretty=1'
curl -XDELETE 'http://localhost:9200/logstash-2015.01.12/loadbalancer/_query?q=tags:_grokparsefailure&pretty=1'

Backing up ES: We need a directory with full access to elasticsearch. I actually not sure if this is necessary or not but this is one of the actions I took to solve a bad problem!

sudo mkdir /usr/share/elasticsearch/backup/
sudo chmod 777 /usr/share/elasticsearch/backup/
sudo chown -R elasticsearch:elasticsearch /usr/share/elasticsearch/backup/

And finally make a snapshot:

curl -XPUT 'http://localhost:9200/_snapshot/dopey_backup' -d '{
    "type": "fs",
    "settings": {
        "compress" : true,
        "location": "/usr/share/elasticsearch/backup"
    }
}'

Restoring the snapshot is also essential:

curl -XPUT "localhost:9200/_snapshot/dopey_backup/snapshot_1?wait_for_completion=true"
curl -XPOST "localhost:9200/_snapshot/dopey_backup/snapshot_1/_restore"
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