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There is a newer version: 8.13.4

/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.index.fielddata;

import org.apache.lucene.index.NumericDocValues;
import org.apache.lucene.search.DoubleValues;

import java.io.IOException;

/**
 * A per-document numeric value.
 */
public abstract class NumericDoubleValues extends DoubleValues {

    /** Sole constructor. (For invocation by subclass
     * constructors, typically implicit.) */
    protected NumericDoubleValues() {}

    // TODO: this interaction with sort comparators is really ugly...
    /** Returns numeric docvalues view of raw double bits */
    public NumericDocValues getRawDoubleValues() {
        return new AbstractNumericDocValues() {
            private int docID = -1;

            @Override
            public boolean advanceExact(int target) throws IOException {
                docID = target;
                return NumericDoubleValues.this.advanceExact(target);
            }

            @Override
            public long longValue() throws IOException {
                return Double.doubleToRawLongBits(NumericDoubleValues.this.doubleValue());
            }

            @Override
            public int docID() {
                return docID;
            }
        };
    }

    // yes... this is doing what the previous code was doing...
    /** Returns numeric docvalues view of raw float bits */
    public NumericDocValues getRawFloatValues() {
        return new AbstractNumericDocValues() {
            private int docID = -1;

            @Override
            public boolean advanceExact(int target) throws IOException {
                docID = target;
                return NumericDoubleValues.this.advanceExact(target);
            }

            @Override
            public long longValue() throws IOException {
                return Float.floatToRawIntBits((float) NumericDoubleValues.this.doubleValue());
            }

            @Override
            public int docID() {
                return docID;
            }
        };
    }
}