Empty Indexes?

(O) #1

Hi there,
I'm running a Graylog server. I accidentally deleted the contents of my index folders.

/var/lib/elasticsearch/nodes/0/indices/TkNxWZ2BQmGznq5Xv77CxQ/3/index# ls
Returns nothing. The same goes for my 0, 1, and 2/index.

I'm not worried about the lost data, but Graylog won't function without Elasticsearch. How can I restore the contents of the folders to a working state?


(David Pilato) #2

DELETE the missing index from the API.
That should fix it I guess.

(O) #3

Sorry. Do you mean I should remove the /var/lib/elastichsearch/nodes/0/indices/TkNxWZ2BQmGznq5Xv77CxQ directory?


(David Pilato) #4

No I meant running

DELETE indexname

From Kibana or from curl

(O) #5

Thanks for the reply.
Before I try that I've got to ask, will Elasticsearch create a new index automatically?


(David Pilato) #6

Only if you send new data to it.

(O) #7

Gotcha. Thanks David

(O) #8

Hi David,
I was hoping maybe you'd be able to assist me here. I did some reading on the API so I'm now able to pass:

curl -X DELETE 'http://localhost:9200/indices/TkNxWZ2BQmGznq5Xv77CxQ/0?pretty'

but the response I get is:

  "found" : false,
  "_index" : "indices",
  "_type" : "TkNxWZ2BQmGznq5Xv77CxQ",
  "_id" : "0",
  "_version" : 1,
  "result" : "not_found",
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0

I've got three indexes that I want to erase before I restart my server, but I can't seem to get the "result" : "deleted" message.

Thanks again

(David Pilato) #9

This is not a valid index name.
You are calling here the Delete Document API.

What are the index names you want to remove?

(O) #10



I believe these are the indexes and their IDs...I'm not too familiar so maybe I'm mistaken. Is there an API to delete a whole index or must I recursively delete each document within an index?

Thanks for your continued help

(David Pilato) #11

I meant the index name not the directory names on disk. You should never look at this.

(O) #12

Oh I see.
This is the only "Indices" I can find on my server.

Is the name for the index = the prefix?


(David Pilato) #13


GET /_cat/indices?v

(O) #14
curl -X GET 'http://localhost:9200/_cat/indices?v'
health status index     uuid                   pri rep docs.count docs.deleted store.size pri.store.size
red    open   graylog_0 TkNxWZ2BQmGznq5Xv77CxQ   4   0                                                  
green  open   graylog_1 rXPAWDDOTZCFutcZ6zGwew   4   0    1211736            0    405.4mb        405.4mb
green  open   syslog__0 SfiLdN55RMqH6LjLzn_StA   4   0          0            0       648b           648b
yellow open   indices   llXr2lFeS72xcrr2yyzgRg   5   1          0            0       839b           839b

David, here's the output.
Can I use the delete command on the "graylog_0" index to have it regenerated?

Thanks again.

(David Pilato) #15

So if you want to remove index graylog_0, run:

DELETE /graylog_0

(O) #16
  "acknowledged" : true

Looks good!
I used PUT /graylog_0 to recreate it.
I restarted my services and now it's working fine!

Thanks for your patience David. Elasticsearch is a very cool platform.

(system) #17

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