[Feature Request] Add field-leval meta to all types #20599
Description
Is your feature request related to a problem? Please describe
Not all fields field types allow meta data, for example:
"mappings": {
"properties": {
"my_flat_object": {
"type": "flat_object",
"meta": { // meta is not supported
"this": "is not allowd"
}
},
"my_text": {
"type": "text",
"meta": { // meta is supported
"this": "is allowed"
}
}
},This is inconsistent and might confuse the user.
The issue discovered during #19884
Describe the solution you'd like
Extract parsing of the meta block to Base Mapper/Parser class and make parseMeta method final to ensure the consistency across all field types.
Such approach will enforce:
- the
metablock to be exclusively field related (independent of the type) - the
metablock is identified exactly the same across all the fields - Validated of the meta block is the same
- reduces the usage of Magic values for string (no repeated "meta" String)
We may introduce simple OpenSearchNames class with all necessary String names:
example:
// OpenSearchNames.java
public class OpenSearchNames {
private OpenSearchNames(){} // no constructors
public static final String META = "meta";
public static final String ID = "_id";
public static final String DOC = "_doc";
// ....
}The util class may grow slowly eradicating the Magic values in the code
Related component
No response
Describe alternatives you've considered
No response
Additional context
No response