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There is a newer version: 6.0.5

/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  If not, see .
 */
package org.graylog.plugins.views.search.elasticsearch;

import org.graylog2.indexer.ranges.IndexRange;
import org.graylog2.indexer.ranges.IndexRangeService;
import org.graylog2.plugin.indexer.searches.timeranges.TimeRange;
import org.graylog2.plugin.streams.Stream;
import org.graylog2.streams.StreamService;

import javax.inject.Inject;
import java.util.Collections;
import java.util.Set;
import java.util.SortedSet;
import java.util.function.BiFunction;
import java.util.stream.Collectors;

public class IndexLookup {
    private final IndexRangeService indexRangeService;
    private final StreamService streamService;

    //this is only here for mocking purposes
    BiFunction, Boolean> indexRangeContainsOneOfStreams = this::indexRangeContainsOneOfStreams;

    @Inject
    public IndexLookup(IndexRangeService indexRangeService, StreamService streamService) {
        this.indexRangeService = indexRangeService;
        this.streamService = streamService;
    }

    public Set indexNamesForStreamsInTimeRange(Set streamIds, TimeRange timeRange) {
        if (streamIds.isEmpty())
            return Collections.emptySet();

        Set usedStreams = streamService.loadByIds(streamIds);
        SortedSet candidateIndices = indexRangeService.find(timeRange.getFrom(), timeRange.getTo());

        return candidateIndices.stream()
                .filter(i -> indexRangeContainsOneOfStreams.apply(i, usedStreams))
                .map(IndexRange::indexName)
                .collect(Collectors.toSet());
    }

    private boolean indexRangeContainsOneOfStreams(IndexRange indexRange, Set streams) {
        return new IndexRangeContainsOneOfStreams(streams).test(indexRange);
    }
}