[Inference API] EIS: adapt paths (#120734) (#120780)

The final EIS task types definitions changes the names of the routes.

Author: maxjakob

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/services/elastic/ElasticInferenceServiceSparseEmbeddingsModel.java

@@ -115,7 +115,7 @@ private URI createUri() throws ElasticsearchStatusException {
         try {
             // TODO, consider transforming the base URL into a URI for better error handling.
             return new URI(
-                elasticInferenceServiceComponents().elasticInferenceServiceUrl() + "/api/v1/sparse-text-embeddings/" + modelIdUriPath
+                elasticInferenceServiceComponents().elasticInferenceServiceUrl() + "/api/v1/embed/text/sparse/" + modelIdUriPath
             );
         } catch (URISyntaxException e) {
             throw new ElasticsearchStatusException(

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/services/elastic/completion/ElasticInferenceServiceCompletionModel.java

@@ -106,7 +106,7 @@ public URI uri() {
     private URI createUri() throws ElasticsearchStatusException {
         try {
             // TODO, consider transforming the base URL into a URI for better error handling.
-            return new URI(elasticInferenceServiceComponents().elasticInferenceServiceUrl() + "/api/v1/chat/completions");
+            return new URI(elasticInferenceServiceComponents().elasticInferenceServiceUrl() + "/api/v1/chat");
         } catch (URISyntaxException e) {
             throw new ElasticsearchStatusException(
                 "Failed to create URI for service ["