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public abstract class MergeScheduler {
void merge(IndexWriter writer, MergeTrigger trigger, boolean newMergesFound){
  if (acquirePermit()) {
    try {
      doMerg(writer, trigger, newMergesFound);
    } finally {
      releasePermit();
    }
  }
}

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# Licensed to Elasticsearch under one or more contributor
# license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright
# ownership. Elasticsearch 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
#

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{
   "mapname":{
      "_all":{
         "enabled":true
      },
      "properties":{
         "importantInfo":{
            "properties":{
               "uselessField1":{
                  "type":"boolean",

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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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

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package org.apache.lucene.index;
/*
 * 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

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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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

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diff --git a/src/main/java/org/elasticsearch/action/terms/ShardTermsByQueryRequest.java b/src/main/java/org/elasticsearch/action/terms/ShardTermsByQueryRequest.java
index 3a16c84..7f31877 100644
--- a/src/main/java/org/elasticsearch/action/terms/ShardTermsByQueryRequest.java
+++ b/src/main/java/org/elasticsearch/action/terms/ShardTermsByQueryRequest.java
@@ -150,7 +150,7 @@ class ShardTermsByQueryRequest extends BroadcastShardOperationRequest {
         } else {
             out.writeVInt(0);
         }
-        out.writeString(field);
+        out.writeString(field); // THIS IS NULL!!

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import com.google.common.util.concurrent.Futures;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.search.SearchType;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.test.AbstractIntegrationTest;

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curl -XDELETE "http://localhost:9200/test?pretty"
curl -XPOST "http://localhost:9200/test?pretty" -d '{
  "settings": {
    "index": {
      "number_of_shards" : 1,
      "number_of_replicas" : 1
    }
  },
  "mappings" : { 
     "participants" : {

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Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.017 sec - in org.elasticsearch.test.unit.cluster.routing.allocation.SingleShardNoReplicasRoutingTests
testSingleIndexStartedShard(org.elasticsearch.test.unit.cluster.routing.allocation.SingleShardNoReplicasRoutingTests)  Time elapsed: 0.001 sec
testSingleIndexShardFailed(org.elasticsearch.test.unit.cluster.routing.allocation.SingleShardNoReplicasRoutingTests)  Time elapsed: 0.001 sec
testMultiIndexEvenDistribution(org.elasticsearch.test.unit.cluster.routing.allocation.SingleShardNoReplicasRoutingTests)  Time elapsed: 0.013 sec
testMultiIndexUnevenNodes(org.elasticsearch.test.unit.cluster.routing.allocation.SingleShardNoReplicasRoutingTests)  Time elapsed: 0.002 sec
Running org.elasticsearch.test.integration.nodesinfo.SimpleNodesInfoTests
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.312 sec - in org.elasticsearch.test.integration.nodesinfo.SimpleNodesInfoTests
testNodeInfoPlugin(org.elasticsearch.test.integration.nodesinfo.S