Removing an ElasticSearch index

First you can run the following command to return a full list of available indexes:

curl localhost:9200/_cat/indices 
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This will return a list similar to the example below:

curl 192.168.80.98:9200/_cat/indices 

yellow open help            JkSNC5T2R2K_G42lx1YWSQ 1 1 190 174 2.5mb 2.5mb 
yellow open new             TFMEZ9fIT5e596_h_y_nUg 1 1 16 16 92.4kb 92.4kb 
yellow open helpdesk2       jTXVSyq0Q_aWGhTMJjPH_A 1 1 190  0 1.4mb 1.4mb 
yellow open dp_helpdesk1    qj3-aDbsTbez3uWxCZqPZw 1 1  2  0  17kb  17kb 
yellow open helpdesk3       vumxtbORRzu0SIHKn3Dv_g 1 1 212  0 1.4mb 1.4mb 
yellow open dp_helpdesk2    QFDDTG4tQmy0qae1zulMOA 1 1  2  0  17kb  17kb 
yellow open helpdesk        8DzG0qn7QXusD7PLC-P_7Q 1 1 16  6 76.5kb 76.5kb
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To then remove one of the indexes you run the following command, specifying the index you want to remove:

curl -X DELETE "localhost:9200/<name_of_index>" 
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Repeat this command to remove every index you want to delete.