diff --git a/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/inference/modelsize/EnsembleSizeInfo.java b/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/inference/modelsize/EnsembleSizeInfo.java
index c6c2a2d818b..0963bccf2b4 100644
--- a/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/inference/modelsize/EnsembleSizeInfo.java
+++ b/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/inference/modelsize/EnsembleSizeInfo.java
@@ -29,7 +29,7 @@ public class EnsembleSizeInfo implements TrainedModelSizeInfo {
 
     public static final ParseField NAME = new ParseField("ensemble_model_size");
     private static final ParseField TREE_SIZES = new ParseField("tree_sizes");
-    private static final ParseField INPUT_FIELD_NAME_LENGHTS = new ParseField("input_field_name_lengths");
+    private static final ParseField FEATURE_NAME_LENGTHS = new ParseField("feature_name_lengths");
     private static final ParseField NUM_OUTPUT_PROCESSOR_WEIGHTS = new ParseField("num_output_processor_weights");
     private static final ParseField NUM_CLASSIFICATION_WEIGHTS = new ParseField("num_classification_weights");
     private static final ParseField NUM_OPERATIONS = new ParseField("num_operations");
@@ -49,7 +49,7 @@ public class EnsembleSizeInfo implements TrainedModelSizeInfo {
     static {
         PARSER.declareObjectArray(constructorArg(), TreeSizeInfo.PARSER::apply, TREE_SIZES);
         PARSER.declareInt(constructorArg(), NUM_OPERATIONS);
-        PARSER.declareIntArray(constructorArg(), INPUT_FIELD_NAME_LENGHTS);
+        PARSER.declareIntArray(constructorArg(), FEATURE_NAME_LENGTHS);
         PARSER.declareInt(optionalConstructorArg(), NUM_OUTPUT_PROCESSOR_WEIGHTS);
         PARSER.declareInt(optionalConstructorArg(), NUM_CLASSIFICATION_WEIGHTS);
         PARSER.declareInt(optionalConstructorArg(), NUM_CLASSES);
@@ -62,20 +62,20 @@ public class EnsembleSizeInfo implements TrainedModelSizeInfo {
 
     private final List<TreeSizeInfo> treeSizeInfos;
     private final int numOperations;
-    private final int[] inputFieldNameLengths;
+    private final int[] featureNameLengths;
     private final int numOutputProcessorWeights;
     private final int numClassificationWeights;
     private final int numClasses;
 
     public EnsembleSizeInfo(List<TreeSizeInfo> treeSizeInfos,
                             int numOperations,
-                            List<Integer> inputFieldNameLengths,
+                            List<Integer> featureNameLengths,
                             int numOutputProcessorWeights,
                             int numClassificationWeights,
                             int numClasses) {
         this.treeSizeInfos = treeSizeInfos;
         this.numOperations = numOperations;
-        this.inputFieldNameLengths = inputFieldNameLengths.stream().mapToInt(Integer::intValue).toArray();
+        this.featureNameLengths = featureNameLengths.stream().mapToInt(Integer::intValue).toArray();
         this.numOutputProcessorWeights = numOutputProcessorWeights;
         this.numClassificationWeights = numClassificationWeights;
         this.numClasses = numClasses;
@@ -90,7 +90,7 @@ public class EnsembleSizeInfo implements TrainedModelSizeInfo {
         long size = EnsembleInferenceModel.SHALLOW_SIZE;
         treeSizeInfos.forEach(t -> t.setNumClasses(numClasses).ramBytesUsed());
         size += sizeOfCollection(treeSizeInfos);
-        size += sizeOfStringCollection(inputFieldNameLengths);
+        size += sizeOfStringCollection(featureNameLengths);
         size += LogisticRegression.SHALLOW_SIZE + sizeOfDoubleArray(numOutputProcessorWeights);
         size += sizeOfDoubleArray(numClassificationWeights);
         return alignObjectSize(size);
@@ -102,7 +102,7 @@ public class EnsembleSizeInfo implements TrainedModelSizeInfo {
         builder.field(TREE_SIZES.getPreferredName(), treeSizeInfos);
         builder.field(NUM_OPERATIONS.getPreferredName(), numOperations);
         builder.field(NUM_CLASSES.getPreferredName(), numClasses);
-        builder.field(INPUT_FIELD_NAME_LENGHTS.getPreferredName(), inputFieldNameLengths);
+        builder.field(FEATURE_NAME_LENGTHS.getPreferredName(), featureNameLengths);
         builder.field(NUM_CLASSIFICATION_WEIGHTS.getPreferredName(), numClassificationWeights);
         builder.field(NUM_OUTPUT_PROCESSOR_WEIGHTS.getPreferredName(), numOutputProcessorWeights);
         builder.endObject();
@@ -119,13 +119,13 @@ public class EnsembleSizeInfo implements TrainedModelSizeInfo {
             numClassificationWeights == that.numClassificationWeights &&
             numClasses == that.numClasses &&
             Objects.equals(treeSizeInfos, that.treeSizeInfos) &&
-            Arrays.equals(inputFieldNameLengths, that.inputFieldNameLengths);
+            Arrays.equals(featureNameLengths, that.featureNameLengths);
     }
 
     @Override
     public int hashCode() {
         int result = Objects.hash(treeSizeInfos, numOperations, numOutputProcessorWeights, numClassificationWeights, numClasses);
-        result = 31 * result + Arrays.hashCode(inputFieldNameLengths);
+        result = 31 * result + Arrays.hashCode(featureNameLengths);
         return result;
     }
 
diff --git a/x-pack/plugin/ml/src/test/java/org/elasticsearch/xpack/ml/inference/modelsize/ModelSizeInfoTests.java b/x-pack/plugin/ml/src/test/java/org/elasticsearch/xpack/ml/inference/modelsize/ModelSizeInfoTests.java
index dfb500c72e7..5787e9ab502 100644
--- a/x-pack/plugin/ml/src/test/java/org/elasticsearch/xpack/ml/inference/modelsize/ModelSizeInfoTests.java
+++ b/x-pack/plugin/ml/src/test/java/org/elasticsearch/xpack/ml/inference/modelsize/ModelSizeInfoTests.java
@@ -74,7 +74,7 @@ public class ModelSizeInfoTests extends AbstractXContentTestCase<ModelSizeInfo>
         "                {\"num_nodes\": 3, \"num_leaves\": 4},\n" +
         "                {\"num_leaves\": 1}\n" +
         "            ],\n" +
-        "            \"input_field_name_lengths\": [\n" +
+        "            \"feature_name_lengths\": [\n" +
         "                14,\n" +
         "                10,\n" +
         "                11\n" +