# Is it expected to have different versions in the \`\*\_LuceneXX\_X.\*\` filenames? **URL:** \ **Category:** Elasticsearch\ **Created:** [September 7, 2022, 2:41pm UTC](https://discuss.elastic.co/t/is-it-expected-to-have-different-versions-in-the-lucenexx-x-filenames/313898 "2022-09-07T14:41:57Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![vkatsikaros](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vkatsikaros/32/110600_2.png) [@vkatsikaros](https://discuss.elastic.co/u/vkatsikaros)\ **Post date:** [September 7, 2022, 2:41pm UTC](https://discuss.elastic.co/t/is-it-expected-to-have-different-versions-in-the-lucenexx-x-filenames/313898/1 "2022-09-07T14:41:57Z")
Hi This is mostly out of curiosity and not as a question tied to a specific problem. I was looking at the actual directories and files of some ES indices, I noticed a bunch of lucene files, but what got my attention is some files such as `_2c_Lucene80_0.dvd` and `_2c_Lucene84_0.doc`. The `80_0` and `84_0` _seem_ like Lucene versions but I could be wrong. We are using ES version 7.10.1, and have upgraded to this version from older 6.x and 7.x versions. So I guess it's expected that the Lucene data went through different versions of Lucene. If these numbers are indeed Lucene versions, I'd like to ask if this is: a) expected? b) does this imply there is some kind of "optimization" I can do for these indices? ```auto /mnt/elasticsearch_0/nodes/0/indices/zmpTxCA2Tb2nLkK3RwZHdA$ ls -alh 0/index/*Lucene* -rw-r--r-- 1 elasticsearch elasticsearch 591M Feb 21 2022 0/index/_2c_Lucene80_0.dvd -rw-r--r-- 1 elasticsearch elasticsearch 3.9K Feb 21 2022 0/index/_2c_Lucene80_0.dvm -rw-r--r-- 1 elasticsearch elasticsearch 256M Feb 21 2022 0/index/_2c_Lucene84_0.doc -rw-r--r-- 1 elasticsearch elasticsearch 105M Feb 21 2022 0/index/_2c_Lucene84_0.pos -rw-r--r-- 1 elasticsearch elasticsearch 542M Feb 21 2022 0/index/_2c_Lucene84_0.tim -rw-r--r-- 1 elasticsearch elasticsearch 9.7M Feb 21 2022 0/index/_2c_Lucene84_0.tip -rw-r--r-- 1 elasticsearch elasticsearch 2.4K Feb 21 2022 0/index/_2c_Lucene84_0.tmd -rw-r--r-- 1 elasticsearch elasticsearch 1.1G Feb 21 2022 0/index/_36_Lucene80_0.dvd -rw-r--r-- 1 elasticsearch elasticsearch 3.7K Feb 21 2022 0/index/_36_Lucene80_0.dvm -rw-r--r-- 1 elasticsearch elasticsearch 518M Feb 21 2022 0/index/_36_Lucene84_0.doc -rw-r--r-- 1 elasticsearch elasticsearch 183M Feb 21 2022 0/index/_36_Lucene84_0.pos -rw-r--r-- 1 elasticsearch elasticsearch 915M Feb 21 2022 0/index/_36_Lucene84_0.tim -rw-r--r-- 1 elasticsearch elasticsearch 21M Feb 21 2022 0/index/_36_Lucene84_0.tip -rw-r--r-- 1 elasticsearch elasticsearch 2.5K Feb 21 2022 0/index/_36_Lucene84_0.tmd -rw-r--r-- 1 elasticsearch elasticsearch 525M Feb 21 2022 0/index/_48_Lucene80_0.dvd -rw-r--r-- 1 elasticsearch elasticsearch 3.5K Feb 21 2022 0/index/_48_Lucene80_0.dvm -rw-r--r-- 1 elasticsearch elasticsearch 226M Feb 21 2022 0/index/_48_Lucene84_0.doc -rw-r--r-- 1 elasticsearch elasticsearch 94M Feb 21 2022 0/index/_48_Lucene84_0.pos -rw-r--r-- 1 elasticsearch elasticsearch 482M Feb 21 2022 0/index/_48_Lucene84_0.tim -rw-r--r-- 1 elasticsearch elasticsearch 9.5M Feb 21 2022 0/index/_48_Lucene84_0.tip -rw-r--r-- 1 elasticsearch elasticsearch 2.6K Feb 21 2022 0/index/_48_Lucene84_0.tmd ``` ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [September 7, 2022, 8:48pm UTC](https://discuss.elastic.co/t/is-it-expected-to-have-different-versions-in-the-lucenexx-x-filenames/313898/2 "2022-09-07T20:48:36Z")
You could try a force merge on all your indices, that would make Lucene recreate things in the latest version. Otherwise, I wouldn't be super worried. ---
**Author:** ![vkatsikaros](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vkatsikaros/32/110600_2.png) [@vkatsikaros](https://discuss.elastic.co/u/vkatsikaros)\ **Post date:** [September 8, 2022, 9:26am UTC](https://discuss.elastic.co/t/is-it-expected-to-have-different-versions-in-the-lucenexx-x-filenames/313898/3 "2022-09-08T09:26:29Z")
Thanks for the suggestion. It seems that force merge doesn't change the situation. Again, I _think_ I see 2 lucene versions due to the `Lucene80_0` and `Lucene84_0` parts in the filenames, I am not sure if this is indeed the case. The index I was looking at was closed. ```auto $ curl -s 'localhost:9200/_cat/indices?v' | grep Y9VTS1sgThK6Jicvt8_Z2A green close foo.boo-2020 Y9VTS1sgThK6Jicvt8_Z2A 1 1 $ curl -s 'localhost:9200/_cat/shards?' | grep foo.boo-2020 foo.boo-2020 0 p STARTED 11171420 1.7gb 10.40.22.115 ip-10-40-22-115 foo.boo-2020 0 r STARTED 11171420 1.7gb 10.40.21.165 ip-10-40-21-165 ``` The initial state with I _think_ is 2 lucene versions ```auto ip-10-40-21-165 $ ls -al /mnt/elasticsearch_*/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/*Lucene* -rw-r--r-- 1 elasticsearch elasticsearch 43429780 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene80_0.dvd -rw-r--r-- 1 elasticsearch elasticsearch 2151 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene80_0.dvm -rw-r--r-- 1 elasticsearch elasticsearch 24150842 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.doc -rw-r--r-- 1 elasticsearch elasticsearch 658361 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.pos -rw-r--r-- 1 elasticsearch elasticsearch 38382222 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.tim -rw-r--r-- 1 elasticsearch elasticsearch 700546 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.tip -rw-r--r-- 1 elasticsearch elasticsearch 40424293 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene80_0.dvd -rw-r--r-- 1 elasticsearch elasticsearch 2151 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene80_0.dvm -rw-r--r-- 1 elasticsearch elasticsearch 22987332 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.doc -rw-r--r-- 1 elasticsearch elasticsearch 622078 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.pos -rw-r--r-- 1 elasticsearch elasticsearch 36119317 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.tim -rw-r--r-- 1 elasticsearch elasticsearch 584489 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.tip ip-10-40-22-115 $ ls -al /mnt/elasticsearch_*/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/*Lucene* -rw-r--r-- 1 elasticsearch elasticsearch 43429780 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene80_0.dvd -rw-r--r-- 1 elasticsearch elasticsearch 2151 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene80_0.dvm -rw-r--r-- 1 elasticsearch elasticsearch 24150842 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.doc -rw-r--r-- 1 elasticsearch elasticsearch 658361 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.pos -rw-r--r-- 1 elasticsearch elasticsearch 38382222 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.tim -rw-r--r-- 1 elasticsearch elasticsearch 700546 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.tip -rw-r--r-- 1 elasticsearch elasticsearch 40424293 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene80_0.dvd -rw-r--r-- 1 elasticsearch elasticsearch 2151 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene80_0.dvm -rw-r--r-- 1 elasticsearch elasticsearch 22987332 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.doc -rw-r--r-- 1 elasticsearch elasticsearch 622078 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.pos -rw-r--r-- 1 elasticsearch elasticsearch 36119317 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.tim -rw-r--r-- 1 elasticsearch elasticsearch 584489 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.tip ``` I open the index ```auto $ curl -X POST "localhost:9200/foo.boo-2020/_open?pretty" { "acknowledged" : true, "shards_acknowledged" : true } ``` Then force merge it ```auto $ curl -X POST "localhost:9200/foo.boo-2020/_forcemerge?pretty" { "_shards" : { "total" : 2, "successful" : 2, "failed" : 0 } } ``` just dumping the setting in case it helps ```auto $ curl "localhost:9200/foo.boo-2020/_settings?pretty" { "foo.boo-2020" : { "settings" : { "index" : { "lifecycle" : { "name" : "keep_forever_move_old" }, "routing" : { "allocation" : { "include" : { "_tier_preference" : "data_warm,data_hot" } } }, "number_of_shards" : "1", "provided_name" : "foo.boo-2020", "creation_date" : "1594598415497", "unassigned" : { "node_left" : { "delayed_timeout" : "15m" } }, "number_of_replicas" : "1", "uuid" : "Y9VTS1sgThK6Jicvt8_Z2A", "version" : { "created" : "7070199", "upgraded" : "7100199" } } } } } ``` no change at all ```auto ip-10-40-22-115 $ ls -al /mnt/elasticsearch_*/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/*Lucene* -rw-r--r-- 1 elasticsearch elasticsearch 38382222 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.tim -rw-r--r-- 1 elasticsearch elasticsearch 700546 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.tip -rw-r--r-- 1 elasticsearch elasticsearch 40424293 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene80_0.dvd -rw-r--r-- 1 elasticsearch elasticsearch 2151 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene80_0.dvm -rw-r--r-- 1 elasticsearch elasticsearch 22987332 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.doc -rw-r--r-- 1 elasticsearch elasticsearch 622078 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.pos -rw-r--r-- 1 elasticsearch elasticsearch 36119317 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.tim -rw-r--r-- 1 elasticsearch elasticsearch 584489 Nov 29 2021 /mnt/elasticsearch_0/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.tip ip-10-40-21-165 $ ls -al /mnt/elasticsearch_*/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/*Lucene* -rw-r--r-- 1 elasticsearch elasticsearch 43429780 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene80_0.dvd -rw-r--r-- 1 elasticsearch elasticsearch 2151 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene80_0.dvm -rw-r--r-- 1 elasticsearch elasticsearch 24150842 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.doc -rw-r--r-- 1 elasticsearch elasticsearch 658361 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.pos -rw-r--r-- 1 elasticsearch elasticsearch 38382222 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.tim -rw-r--r-- 1 elasticsearch elasticsearch 700546 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_2l_Lucene84_0.tip -rw-r--r-- 1 elasticsearch elasticsearch 40424293 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene80_0.dvd -rw-r--r-- 1 elasticsearch elasticsearch 2151 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene80_0.dvm -rw-r--r-- 1 elasticsearch elasticsearch 22987332 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.doc -rw-r--r-- 1 elasticsearch elasticsearch 622078 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.pos -rw-r--r-- 1 elasticsearch elasticsearch 36119317 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.tim -rw-r--r-- 1 elasticsearch elasticsearch 584489 May 12 05:37 /mnt/elasticsearch_1/nodes/0/indices/Y9VTS1sgThK6Jicvt8_Z2A/0/index/_41_Lucene84_0.tip ``` ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [October 6, 2022, 9:27am UTC](https://discuss.elastic.co/t/is-it-expected-to-have-different-versions-in-the-lucenexx-x-filenames/313898/4 "2022-10-06T09:27:17Z")
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