Luca Belluccini 2d3bcc483d [DOCS] Warn only one date format is added to the field date formats when using dynamic_date_formats (#88915) ... * [DOCS] Warn only one date format is added to the field date formats When using multiple options in `dynamic_date_formats`, only one of the formats of the first document having a date matching one of the date formats provided will be used. E.g. ``` PUT my-index-000001 { "mappings": { "dynamic_date_formats": [ "yyyy/MM", "MM/dd/yyyy"] } } PUT my-index-000001/_doc/1 { "create_date": "09/25/2015" } ``` The generated mappings will be: ``` "mappings": { "dynamic_date_formats": [ "yyyy/MM", "MM/dd/yyyy" ], "properties": { "create_date": { "type": "date", "format": "MM/dd/yyyy" } } }, ``` Indexing a document with `2015/12` would lead to the `format` `"yyyy/MM"` being used for the `create_date`. This can be misleading especially if the user is using multiple date formats on the same field. The first document will determine the format of the `date` field being detected. Maybe we should provide an additional example, such as: ``` PUT my-index-000001 { "mappings": { "dynamic_date_formats": [ "yyyy/MM||MM/dd/yyyy"] } } ``` My wording is not great, so feel free to amend/edit. * Update docs/reference/mapping/dynamic/field-mapping.asciidoc Reword and add code example * Turned discussion of the two syntaxes into an admonition * Fix failing tests Co-authored-by: Abdon Pijpelink <abdon.pijpelink@elastic.co>		2022-08-11 10:43:53 +02:00
..
field-mapping.asciidoc	[DOCS] Warn only one date format is added to the field date formats when using dynamic_date_formats (#88915)	2022-08-11 10:43:53 +02:00
templates.asciidoc	[DOCS] Update dynamic mapping docs to clarify supported match_mapping_type (#83274)	2022-02-01 10:37:27 -05:00