remove func interface

Author: tlrx

modules/repository-azure/src/main/java/org/elasticsearch/repositories/azure/AzureBlobStore.java

@@ -50,7 +50,6 @@
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.core.util.Throwables;
 import org.elasticsearch.cluster.metadata.RepositoryMetadata;
-import org.elasticsearch.common.CheckedBiFunction;
 import org.elasticsearch.common.UUIDs;
 import org.elasticsearch.common.blobstore.BlobContainer;
 import org.elasticsearch.common.blobstore.BlobPath;
@@ -477,7 +476,7 @@ void writeBlobAtomic(
         final OperationPurpose purpose,
         final String blobName,
         final long blobSize,
-        final CheckedBiFunction<Long, Long, InputStream, IOException> provider,
+        final BlobContainer.BlobMultiPartInputStreamProvider provider,
         final boolean failIfAlreadyExists
     ) throws IOException {
         try {
@@ -559,7 +558,7 @@ private static Mono<String> stageBlock(
         BlockBlobAsyncClient asyncClient,
         String blobName,
         MultiPart multiPart,
-        CheckedBiFunction<Long, Long, InputStream, IOException> provider
+        BlobContainer.BlobMultiPartInputStreamProvider provider
     ) {
         logger.debug(
             "{}: staging part [{}] of size [{}] from offset [{}]",

server/src/main/java/org/elasticsearch/common/blobstore/BlobContainer.java

@@ -10,7 +10,6 @@
 package org.elasticsearch.common.blobstore;
 
 import org.elasticsearch.action.ActionListener;
-import org.elasticsearch.common.CheckedBiFunction;
 import org.elasticsearch.common.blobstore.support.BlobMetadata;
 import org.elasticsearch.common.bytes.BytesArray;
 import org.elasticsearch.common.bytes.BytesReference;
@@ -156,8 +155,7 @@ default boolean supportsConcurrentMultipartUploads() {
     /**
      * Provides an {@link InputStream} to read a part of the blob content.
      */
-    @FunctionalInterface
-    interface BlobMultiPartInputStreamProvider extends CheckedBiFunction<Long, Long, InputStream, IOException> {
+    interface BlobMultiPartInputStreamProvider {
         /**
          * Provides an {@link InputStream} to read a part of the blob content.
          *
@@ -166,8 +164,7 @@ interface BlobMultiPartInputStreamProvider extends CheckedBiFunction<Long, Long,
          * @return              an {@link InputStream} to read a part of the blob content.
          * @throws IOException  if something goes wrong opening the input stream
          */
-        @Override
-        InputStream apply(Long offset, Long length) throws IOException;
+        InputStream apply(long offset, long length) throws IOException;
     }
 
     /**