[Mappings editor] Add descriptions for join, nested, object, percolator, rank_feature and rank_features.

[cjcenizal]

[elasticmachine]

Pinging @elastic/es-ui (Team:Elasticsearch UI)

[gchaps]

Join fields define parent-child relationships among documents of the same index.

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Nested fields can contain child objects that you can query independently.

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Object fields can contain children, which are queried together. To query child objects independently, use the nested data type.

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Use the percolator data type to match queries stored in an index.

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The rank feature field accepts a number that will increase the relevance score of documents.

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The rank features fields accepts a numeric vector that will increase the relevance score of documents.

Is it ok to remove the word feature from "numeric feature vector"?

[cjcenizal]

Merging now to expedite things. I'll address CI problems on the main branch.

[kibanamachine]

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• continuous-integration/kibana-ci/pull-request
• Commit: 7135079

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• 💚 Build #20381 succeeded 7be0c53
• 💚 Build #20378 succeeded d9897b3

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