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Graylog
There is a newer version: 5.2.7
/**
 * 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.graylog2.configuration;

import com.github.joschi.jadconfig.Parameter;
import com.github.joschi.jadconfig.util.Duration;
import com.github.joschi.jadconfig.validators.PositiveDurationValidator;
import com.github.joschi.jadconfig.validators.PositiveIntegerValidator;
import org.graylog2.configuration.converters.URIListConverter;
import org.graylog2.configuration.validators.ListOfURIsWithHostAndSchemeValidator;
import org.graylog2.configuration.validators.NonEmptyListValidator;

import java.net.URI;
import java.util.Collections;
import java.util.List;

public class ElasticsearchClientConfiguration {
    @Parameter(value = "elasticsearch_hosts", converter = URIListConverter.class, validators = {NonEmptyListValidator.class, ListOfURIsWithHostAndSchemeValidator.class})
    List elasticsearchHosts = Collections.singletonList(URI.create("http://127.0.0.1:9200"));

    @Parameter(value = "elasticsearch_connect_timeout")
    Duration elasticsearchConnectTimeout = Duration.seconds(10);

    @Parameter(value = "elasticsearch_socket_timeout", validators = {PositiveDurationValidator.class})
    Duration elasticsearchSocketTimeout = Duration.seconds(60);

    @Parameter(value = "elasticsearch_idle_timeout")
    Duration elasticsearchIdleTimeout = Duration.seconds(-1L);

    @Parameter(value = "elasticsearch_max_total_connections", validators = {PositiveIntegerValidator.class})
    int elasticsearchMaxTotalConnections = 20;

    @Parameter(value = "elasticsearch_max_total_connections_per_route", validators = {PositiveIntegerValidator.class})
    int elasticsearchMaxTotalConnectionsPerRoute = 2;

    @Parameter(value = "elasticsearch_max_retries", validators = {PositiveIntegerValidator.class})
    int elasticsearchMaxRetries = 2;

    @Parameter(value = "elasticsearch_discovery_enabled")
    boolean discoveryEnabled = false;

    @Parameter(value = "elasticsearch_discovery_filter")
    String discoveryFilter = null;

    @Parameter(value = "elasticsearch_discovery_frequency", validator = PositiveDurationValidator.class)
    Duration discoveryFrequency = Duration.seconds(30L);

    @Parameter(value = "elasticsearch_compression_enabled")
    boolean compressionEnabled = false;
}