checkArgument(values.length > 0);
    double mean = values[0];
    for (int index = 1; index < values.length; index++) {
      double value = values[index];
      if (isFinite(value) && isFinite(mean)) {
        // Art of Computer Programming vol. 2, Knuth, 4.2.2, (15)
        mean += (value - mean) / (index + 1);
      } else {
        mean = calculateNewMeanNonFinite(mean, value);
      }
    }

{
  "settings": {
    "index": {
      "refresh_interval": "1s",
      "number_of_shards": 1,
      "number_of_replicas": 0,
      "auto_expand_replicas": "0-1"
    }
  }

{
  "settings": {
    "index": {
      "refresh_interval": "1s",
      "number_of_shards": 1,
      "number_of_replicas": 0,
      "auto_expand_replicas": "0-1"
    }
  }

{
  "settings": {
    "index": {
      "refresh_interval": "1s",
      "number_of_shards": 1,
      "number_of_replicas": 0,
      "auto_expand_replicas": "0-1"
    }
  }

{
  "settings": {
    "index": {
      "refresh_interval": "1s",
      "number_of_shards": 5,
      "number_of_replicas": 0,
      "auto_expand_replicas": "0-1"
    }
  }

package org.codelibs.fess.query;

import org.apache.lucene.index.Term;
import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.codelibs.fess.Constants;
import org.codelibs.fess.entity.QueryContext;
import org.codelibs.fess.exception.InvalidQueryException;
import org.junit.jupiter.api.Test;
import org.opensearch.index.query.FuzzyQueryBuilder;

  }

  @Override
  public ImmutableList<V> asList() {
    ImmutableList<Entry<K, V>> entryList = map.entrySet().asList();
    return new ImmutableList<V>() {
      @Override
      public V get(int index) {
        return entryList.get(index).getValue();
      }

      @Override
      boolean isPartialView() {
        return true;
      }

      @Override
      public int size() {
        return entryList.size();

    ImmutableSet<E> result = elementSet;
    return (result == null) ? elementSet = new ElementSet<>(entries, this) : result;
  }

  @Override
  Entry<E> getEntry(int index) {
    return entries.get(index);
  }

  @Override
  boolean isPartialView() {
    return false;
  }

  @Override
  public int size() {
    return Ints.saturatedCast(size);
  }

          "gidNumber" : {
            "type" : "long"
          },
          "name" : {
            "type" : "keyword"
          }
        }
      }
    },
    "settings" : {
      "index" : {
        "creation_date" : "1509021058796",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "5EWS2-qMT2WwHG0yPrhP3Q",
        "version" : {
          "created" : "6000051"

 */
package org.codelibs.fess.query;

import static org.codelibs.core.stream.StreamUtil.stream;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.search.Query;
import org.codelibs.fess.Constants;
import org.codelibs.fess.entity.QueryContext;