# 7.7 ILM Best Compression

**URL:** <https://discuss.elastic.co/t/7-7-ilm-best-compression/233279>\
**Category:** Elasticsearch\
**Created:** [May 19, 2020, 8:40am UTC](https://discuss.elastic.co/t/7-7-ilm-best-compression/233279 "2020-05-19T08:40:26Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![probson](https://avatars.discourse-cdn.com/v4/letter/p/e47c2d/32.png) [@probson](https://discuss.elastic.co/u/probson)\
**Post date:** [May 19, 2020, 8:40am UTC](https://discuss.elastic.co/t/7-7-ilm-best-compression/233279/1 "2020-05-19T08:40:26Z")

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From the release notes of 7.7 there is  
Adding best\_compression [#49974](https://github.com/elastic/elasticsearch/pull/49974)

I have upgraded to 7.7 and cannot find best compression under ILM and cannot find anything in the guides. Has thise been implemented yet?

Thanks  
Phil

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**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [May 19, 2020, 9:52am UTC](https://discuss.elastic.co/t/7-7-ilm-best-compression/233279/2 "2020-05-19T09:52:44Z")

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Yes, you do this by setting `"codec": "best_compression"` in the [force-merge action](https://www.elastic.co/guide/en/elasticsearch/reference/current/ilm-forcemerge.html).

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**Author:** ![probson](https://avatars.discourse-cdn.com/v4/letter/p/e47c2d/32.png) [@probson](https://discuss.elastic.co/u/probson)\
**Post date:** [May 21, 2020, 10:19am UTC](https://discuss.elastic.co/t/7-7-ilm-best-compression/233279/3 "2020-05-21T10:19:36Z")

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Hi @DavidTurner,

I have tried modifying my ILM via the below:

```auto

PUT _ilm/policy/winlogbeat-7.5.0
{
  "policy": {
    "phases": {
      "warm": {
        "actions": {
          "forcemerge" : {
            "max_num_segments": 1,
            "codec": "best_compression"
          }
        }
      }
    }
  }
}

```

But i get:

```auto
{
  "error" : {
    "root_cause" : [
      {
        "type" : "x_content_parse_exception",
        "reason" : "[8:13] [forcemerge] unknown field [codec]"
      }
    ],
    "type" : "x_content_parse_exception",
    "reason" : "[8:22] [put_lifecycle_request] failed to parse field [policy]",
    "caused_by" : {
      "type" : "x_content_parse_exception",
      "reason" : "[8:22] [lifecycle_policy] failed to parse field [phases]",
      "caused_by" : {
        "type" : "x_content_parse_exception",
        "reason" : "[8:22] [phases] failed to parse field [warm]",
        "caused_by" : {
          "type" : "x_content_parse_exception",
          "reason" : "[8:22] [phase] failed to parse field [actions]",
          "caused_by" : {
            "type" : "x_content_parse_exception",
            "reason" : "[8:22] [actions] failed to parse field [forcemerge]",
            "caused_by" : {
              "type" : "x_content_parse_exception",
              "reason" : "[8:13] [forcemerge] unknown field [codec]"
            }
          }
        }
      }
    }
  },
  "status" : 400
}

```

Any suggestions?

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<div class="post-metadata">

**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [May 21, 2020, 12:05pm UTC](https://discuss.elastic.co/t/7-7-ilm-best-compression/233279/4 "2020-05-21T12:05:59Z")

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Oh dear. It was supposed to be called `codec` but it seems it's actually `index_codec` in 7.7.0. I opened [https://github.com/elastic/elasticsearch/issues/57034](https://github.com/elastic/elasticsearch/issues/57034) to disentangle this.

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<div class="post-metadata">

**Author:** ![probson](https://avatars.discourse-cdn.com/v4/letter/p/e47c2d/32.png) [@probson](https://discuss.elastic.co/u/probson)\
**Post date:** [May 21, 2020, 1:55pm UTC](https://discuss.elastic.co/t/7-7-ilm-best-compression/233279/5 "2020-05-21T13:55:00Z")

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@DavidTurner

Great thank you, it has now accepted that.

Thanks  
Phil

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [June 18, 2020, 1:55pm UTC](https://discuss.elastic.co/t/7-7-ilm-best-compression/233279/6 "2020-06-18T13:55:01Z")

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