Force merge on read_only index yields error


I'm looking to manage some of our old indices by making them read only and force merging them down to one segment. According to
I'm supposed to set the index to read only first so:

PUT my_index/_settings
"index": {
"blocks.read_only": true

at which point I received "acknowledged" : "true"

Then next I submitted:

POST my_index/_forcemerge?max_num_segments=1

at which point I had returned:

"type"=>"cluster_block_exception", "reason"=>"blocked by: [FORBIDDEN/5/index read-only / allow delete (api)];"
"status": 403

Does this mean I DON'T set the index to read_only?
Or is there something else going on?

The two nodes this particular index is on are low on disk space (which is one of the reasons I'm doing this), so I'm wondering if that is a factor.



Support pointed out what I missed: I'm on version 5.6.3 and the instructions I was following were for 6.x. In version 5.6.x, according to:

you do not need to make the index read only before doing a force merge.

(system) #3

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