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[DOCS] Add text_expansion deprecation usage note (#115529) (#115537)

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docs/reference/query-dsl/text-expansion-query.asciidoc
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@ -7,6 +7,13 @@
deprecated[8.15.0, This query has been replaced by <<query-dsl-sparse-vector-query>>.] deprecated[8.15.0, This query has been replaced by <<query-dsl-sparse-vector-query>>.]
.Deprecation usage note
****
You can continue using `rank_features` fields with `text_expansion` queries in the current version.
However, if you plan to upgrade, we recommend updating mappings to use the `sparse_vector` field type and <<docs-reindex,reindexing your data>>.
This will allow you to take advantage of the new capabilities and improvements available in newer versions.
****
The text expansion query uses a {nlp} model to convert the query text into a list of token-weight pairs which are then used in a query against a The text expansion query uses a {nlp} model to convert the query text into a list of token-weight pairs which are then used in a query against a
<<sparse-vector,sparse vector>> or <<rank-features,rank features>> field. <<sparse-vector,sparse vector>> or <<rank-features,rank features>> field.