[ML] Remove rate limit field from services API for EIS (elastic#135838) (elastic#136284)

The Elastic Inference Service does not accept a rate limit setting 
and should not be declared in service configuration.

Author: davidkyle

docs/changelog/135838.yaml

@@ -0,0 +1,5 @@
+pr: 135838
+summary: Remove rate limit field from services API for EIS
+area: Machine Learning
+type: bug
+issues: []

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

@@ -64,7 +64,6 @@
 import org.elasticsearch.xpack.inference.services.elastic.rerank.ElasticInferenceServiceRerankServiceSettings;
 import org.elasticsearch.xpack.inference.services.elastic.sparseembeddings.ElasticInferenceServiceSparseEmbeddingsModel;
 import org.elasticsearch.xpack.inference.services.elastic.sparseembeddings.ElasticInferenceServiceSparseEmbeddingsServiceSettings;
-import org.elasticsearch.xpack.inference.services.settings.RateLimitSettings;
 import org.elasticsearch.xpack.inference.telemetry.TraceContext;
 
 import java.util.EnumSet;
@@ -683,12 +682,6 @@ public static InferenceServiceConfiguration createConfiguration(EnumSet<TaskType
                 .build()
         );
 
-        configurationMap.putAll(
-            RateLimitSettings.toSettingsConfiguration(
-                EnumSet.of(TaskType.SPARSE_EMBEDDING, TaskType.CHAT_COMPLETION, TaskType.RERANK, TaskType.TEXT_EMBEDDING)
-            )
-        );
-
         return new InferenceServiceConfiguration.Builder().setService(NAME)
             .setName(SERVICE_NAME)
             .setTaskTypes(enabledTaskTypes)

x-pack/plugin/inference/src/test/java/org/elasticsearch/xpack/inference/services/elastic/ElasticInferenceServiceTests.java

@@ -971,15 +971,6 @@ public void testCreateConfiguration() throws Exception {
                        "name": "Elastic",
                        "task_types": ["sparse_embedding", "chat_completion", "text_embedding"],
                        "configurations": {
-                           "rate_limit.requests_per_minute": {
-                               "description": "Minimize the number of rate limit errors.",
-                               "label": "Rate Limit",
-                               "required": false,
-                               "sensitive": false,
-                               "updatable": false,
-                               "type": "int",
-                               "supported_task_types": ["text_embedding", "sparse_embedding" , "rerank", "chat_completion"]
-                           },
                            "model_id": {
                                "description": "The name of the model to use for the inference task.",
                                "label": "Model ID",
@@ -1028,15 +1019,6 @@ public void testGetConfiguration_WithoutSupportedTaskTypes() throws Exception {
                        "name": "Elastic",
                        "task_types": [],
                        "configurations": {
-                           "rate_limit.requests_per_minute": {
-                               "description": "Minimize the number of rate limit errors.",
-                               "label": "Rate Limit",
-                               "required": false,
-                               "sensitive": false,
-                               "updatable": false,
-                               "type": "int",
-                               "supported_task_types": ["text_embedding", "sparse_embedding" , "rerank", "chat_completion"]
-                           },
                            "model_id": {
                                "description": "The name of the model to use for the inference task.",
                                "label": "Model ID",