# Decompressing Elasticsearch 2 snapshot metadata

**URL:** <https://discuss.elastic.co/t/decompressing-elasticsearch-2-snapshot-metadata/47466>\
**Category:** Elasticsearch\
**Created:** [April 15, 2016, 7:17am UTC](https://discuss.elastic.co/t/decompressing-elasticsearch-2-snapshot-metadata/47466 "2016-04-15T07:17:40Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![nvitucci](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nvitucci/32/22892_2.png) [@nvitucci](https://discuss.elastic.co/u/nvitucci)\
**Post date:** [April 15, 2016, 7:17am UTC](https://discuss.elastic.co/t/decompressing-elasticsearch-2-snapshot-metadata/47466/1 "2016-04-15T07:17:40Z")

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Hello,

I used to be able to manually decompress Elasticsearch 1.7 snapshot metadata (and thus read index settings and mappings) by using a LZF decompressor. With Elasticsearch 2.x this appears to be no longer the case. How can I manually decompress the new snapshot metadata files?

Nicola

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**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [April 15, 2016, 7:32am UTC](https://discuss.elastic.co/t/decompressing-elasticsearch-2-snapshot-metadata/47466/2 "2016-04-15T07:32:38Z")

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What is ES1, ES2? Sorry I don't understand the question.

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**Author:** ![nvitucci](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nvitucci/32/22892_2.png) [@nvitucci](https://discuss.elastic.co/u/nvitucci)\
**Post date:** [April 15, 2016, 7:44am UTC](https://discuss.elastic.co/t/decompressing-elasticsearch-2-snapshot-metadata/47466/3 "2016-04-15T07:44:20Z")

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I edited the question to clarify.

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**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [April 15, 2016, 8:08am UTC](https://discuss.elastic.co/t/decompressing-elasticsearch-2-snapshot-metadata/47466/4 "2016-04-15T08:08:06Z")

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I have no idea but @Igor_Motov might know.

Wondering why you are doing that though?

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**Author:** ![nvitucci](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nvitucci/32/22892_2.png) [@nvitucci](https://discuss.elastic.co/u/nvitucci)\
**Post date:** [April 15, 2016, 8:11am UTC](https://discuss.elastic.co/t/decompressing-elasticsearch-2-snapshot-metadata/47466/5 "2016-04-15T08:11:17Z")

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Because I need to extract the mappings from a large snapshot and I don't want to restore it.

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**Author:** ![Igor\_Motov](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/igor_motov/32/45193_2.png) [@Igor\_Motov](https://discuss.elastic.co/u/Igor_Motov)\
**Post date:** [April 15, 2016, 2:50pm UTC](https://discuss.elastic.co/t/decompressing-elasticsearch-2-snapshot-metadata/47466/6 "2016-04-15T14:50:15Z")

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It is quite complicated now due to the format change. The metadata is now stored in SMILE format (not JSON as it was before) and is preceded by a header with format version and followed by footer with checksum that is checked during restore to make sure the file wasn't corrupted. You can find a snippet of the code that reads these files [here](https://github.com/elastic/elasticsearch/blob/0f00c14afc8428a2a72c0b766d2171029dc8f6e1/core/src/main/java/org/elasticsearch/repositories/blobstore/ChecksumBlobStoreFormat.java#L106)

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 5, 2017, 10:58pm UTC](https://discuss.elastic.co/t/decompressing-elasticsearch-2-snapshot-metadata/47466/7 "2017-07-05T22:58:58Z")

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