Github user MikeThomsen commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/2546#discussion_r181036257
  
    --- Diff: 
nifi-nar-bundles/nifi-mongodb-bundle/nifi-mongodb-processors/src/main/java/org/apache/nifi/processors/mongodb/gridfs/DeleteGridFS.java
 ---
    @@ -0,0 +1,161 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *   http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing,
    + * software distributed under the License is distributed on an
    + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    + * KIND, either express or implied.  See the License for the
    + * specific language governing permissions and limitations
    + * under the License.
    + */
    +
    +package org.apache.nifi.processors.mongodb.gridfs;
    +
    +import com.mongodb.client.MongoCursor;
    +import com.mongodb.client.gridfs.GridFSBucket;
    +import com.mongodb.client.gridfs.model.GridFSFile;
    +import org.apache.nifi.annotation.behavior.InputRequirement;
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.components.ValidationContext;
    +import org.apache.nifi.components.ValidationResult;
    +import org.apache.nifi.expression.ExpressionLanguageScope;
    +import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.processor.ProcessContext;
    +import org.apache.nifi.processor.ProcessSession;
    +import org.apache.nifi.processor.Relationship;
    +import org.apache.nifi.processor.exception.ProcessException;
    +import org.apache.nifi.processor.util.StandardValidators;
    +import org.apache.nifi.util.StringUtils;
    +import org.bson.Document;
    +
    +import java.util.ArrayList;
    +import java.util.Collection;
    +import java.util.HashSet;
    +import java.util.List;
    +import java.util.Set;
    +
    +@CapabilityDescription("Deletes a file from GridFS using a file name or a 
query.")
    +@Tags({"gridfs", "delete", "mongodb"})
    +@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
    +public class DeleteGridFS extends AbstractGridFSProcessor {
    +    static final PropertyDescriptor QUERY = new 
PropertyDescriptor.Builder()
    +        .name("delete-gridfs-query")
    +        .displayName("Query")
    +        .description("A valid MongoDB query to use to find and delete one 
or more files from GridFS.")
    +        
.expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBUTES)
    +        .addValidator(DOCUMENT_VALIDATOR)
    +        .required(false)
    +        .build();
    +
    +    static final PropertyDescriptor FILE_NAME = new 
PropertyDescriptor.Builder()
    +        .name("gridfs-file-name")
    +        .displayName("File Name")
    --- End diff --
    
    It's like buckets from everything I've seen, so I'll clarify that.


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