initialize current chunk count

Signed-off-by: yuye-aws <[email protected]>

src/main/java/org/opensearch/neuralsearch/processor/DocumentChunkingProcessor.java

@@ -179,7 +179,7 @@ private List<String> chunkLeafType(Object value) {
     @Override
     public IngestDocument execute(IngestDocument ingestDocument) {
         validateEmbeddingFieldsValue(ingestDocument);
-
+        current_chunk_count = 0;
         if (Objects.equals(chunkerType, FIXED_LENGTH_ALGORITHM)) {
             // add maxTokenCount setting from index metadata to chunker parameters
             Map<String, Object> sourceAndMetadataMap = ingestDocument.getSourceAndMetadata();