# Elasticsearch keys

**URL:** <https://discuss.elastic.co/t/elasticsearch-keys/159997>\
**Category:** Elasticsearch\
**Created:** [December 8, 2018, 8:44am UTC](https://discuss.elastic.co/t/elasticsearch-keys/159997 "2018-12-08T08:44:05Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![15hawai15](https://avatars.discourse-cdn.com/v4/letter/1/b3f665/32.png) [@15hawai15](https://discuss.elastic.co/u/15hawai15)\
**Post date:** [December 8, 2018, 8:44am UTC](https://discuss.elastic.co/t/elasticsearch-keys/159997/1 "2018-12-08T08:44:05Z")

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Binding key consisting of an injection type and an optional annotation. Matches the type and annotation at a point of injection. -\> this is comment from elasticsearch code. Is this representation of key from key-value structure? What are key annotations and annotation types please?

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**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:** [December 8, 2018, 8:44am UTC](https://discuss.elastic.co/t/elasticsearch-keys/159997/2 "2018-12-08T08:44:46Z")

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Can you link to the code in question?

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**Author:** ![15hawai15](https://avatars.discourse-cdn.com/v4/letter/1/b3f665/32.png) [@15hawai15](https://discuss.elastic.co/u/15hawai15)\
**Post date:** [December 8, 2018, 8:47am UTC](https://discuss.elastic.co/t/elasticsearch-keys/159997/3 "2018-12-08T08:47:30Z")

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Sure: [https://github.com/elastic/elasticsearch/blob/master/server/src/main/java/org/elasticsearch/common/inject/Key.java](https://github.com/elastic/elasticsearch/blob/master/server/src/main/java/org/elasticsearch/common/inject/Key.java)

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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:** [January 5, 2019, 8:47am UTC](https://discuss.elastic.co/t/elasticsearch-keys/159997/4 "2019-01-05T08:47:37Z")

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Closed on January 5, 2019, 8:47am UTC

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