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elasticsearch-hadoop is Open Source, released under Apache 2 license:
Licensed to Elasticsearch under one or more contributor license agreements. Elasticsearch licenses this file to you under the Apache 2 license, quoted below. Copyright 2009-2015 Elasticsearch <http://www.elastic.co> Licensed 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.