Hi,

I got a problem when bulk loading 1 ttl file (2.1G) to Stardog, when I checked log, it stucks at computing statistics phase

```
INFO 2019-10-02 06:18:21,752 [stardog-user-1] com.complexible.stardog.index.Index:printInternal(314): Indexing triples: 100% complete in 00:01:51 (907.4K triples/sec)
INFO 2019-10-02 06:18:21,753 [stardog-user-1] com.complexible.stardog.index.Index:stop(326):
INFO 2019-10-02 06:18:21,753 [stardog-user-1] com.complexible.stardog.index.Index:stop(329): Indexing triples finished in 00:01:51.182
INFO 2019-10-02 06:18:30,406 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 3% complete in 00:00:08 (355.5K triples/sec)
INFO 2019-10-02 06:18:34,395 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 4% complete in 00:00:12 (322.8K triples/sec)
INFO 2019-10-02 06:18:36,818 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 5% complete in 00:00:14 (338.0K triples/sec)
INFO 2019-10-02 06:18:39,070 [Stardog.Executor-116] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 6% complete in 00:00:17 (352.4K triples/sec)
INFO 2019-10-02 06:18:41,232 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 7% complete in 00:00:19 (365.2K triples/sec)
INFO 2019-10-02 06:18:43,110 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 8% complete in 00:00:21 (380.4K triples/sec)
INFO 2019-10-02 06:18:44,972 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 9% complete in 00:00:23 (393.4K triples/sec)
INFO 2019-10-02 06:18:48,002 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 10% complete in 00:00:26 (386.4K triples/sec)
INFO 2019-10-02 06:18:49,730 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 11% complete in 00:00:27 (398.6K triples/sec)
INFO 2019-10-02 06:18:51,286 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 12% complete in 00:00:29 (411.9K triples/sec)
INFO 2019-10-02 06:18:52,682 [Stardog.Executor-120] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 13% complete in 00:00:30 (426.0K triples/sec)
INFO 2019-10-02 06:18:54,064 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 14% complete in 00:00:32 (439.0K triples/sec)
INFO 2019-10-02 06:18:55,371 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 15% complete in 00:00:33 (452.0K triples/sec)
INFO 2019-10-02 06:18:56,741 [Stardog.Executor-113] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 16% complete in 00:00:34 (463.2K triples/sec)
INFO 2019-10-02 06:18:58,093 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 17% complete in 00:00:36 (473.8K triples/sec)
INFO 2019-10-02 06:18:59,416 [Stardog.Executor-107] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 18% complete in 00:00:37 (484.0K triples/sec)
INFO 2019-10-02 06:19:00,695 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 19% complete in 00:00:38 (494.0K triples/sec)
INFO 2019-10-02 06:19:01,913 [Stardog.Executor-120] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 20% complete in 00:00:40 (504.2K triples/sec)
INFO 2019-10-02 06:19:11,130 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 21% complete in 00:00:49 (430.3K triples/sec)
INFO 2019-10-02 06:19:12,278 [Stardog.Executor-116] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 22% complete in 00:00:50 (440.5K triples/sec)
INFO 2019-10-02 06:19:13,476 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 23% complete in 00:00:51 (449.8K triples/sec)
INFO 2019-10-02 06:19:14,947 [Stardog.Executor-0] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 24% complete in 00:00:53 (456.4K triples/sec)
INFO 2019-10-02 06:19:17,117 [Stardog.Executor-0] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 24% complete in 00:00:55 (438.5K triples/sec)
INFO 2019-10-02 06:19:19,736 [Stardog.Executor-0] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 26% complete in 00:00:57 (453.5K triples/sec)
INFO 2019-10-02 06:19:21,723 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 26% complete in 00:00:59 (438.4K triples/sec)
INFO 2019-10-02 06:19:23,648 [Stardog.Executor-120] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 27% complete in 00:01:01 (441.1K triples/sec)
INFO 2019-10-02 06:19:25,537 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 29% complete in 00:01:03 (459.7K triples/sec)
INFO 2019-10-02 06:19:28,897 [Stardog.Executor-113] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 30% complete in 00:01:07 (451.7K triples/sec)
INFO 2019-10-02 06:19:30,918 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 30% complete in 00:01:09 (438.5K triples/sec)
INFO 2019-10-02 06:19:32,952 [Stardog.Executor-0] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 32% complete in 00:01:11 (454.3K triples/sec)
INFO 2019-10-02 06:19:34,953 [Stardog.Executor-120] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 33% complete in 00:01:13 (455.7K triples/sec)
INFO 2019-10-02 06:19:38,499 [Stardog.Executor-120] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 34% complete in 00:01:16 (447.8K triples/sec)
INFO 2019-10-02 06:19:40,645 [Stardog.Executor-113] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 35% complete in 00:01:18 (448.4K triples/sec)
INFO 2019-10-02 06:19:42,760 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 35% complete in 00:01:20 (436.7K triples/sec)
INFO 2019-10-02 06:19:58,129 [Stardog.Executor-0] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 36% complete in 00:01:36 (377.4K triples/sec)
INFO 2019-10-02 06:20:00,077 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 37% complete in 00:01:38 (380.2K triples/sec)
INFO 2019-10-02 06:20:02,928 [Stardog.Executor-118] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 39% complete in 00:01:41 (389.4K triples/sec)
INFO 2019-10-02 06:20:04,557 [Stardog.Executor-113] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 40% complete in 00:01:42 (393.1K triples/sec)
INFO 2019-10-02 06:20:06,233 [Stardog.Executor-107] com.complexible.stardog.index.Index:printInternal(314): Computing statistics: 41% complete in 00:01:44 (396.4K triples/sec)
```

I ran stardog with `export STARDOG_SERVER_JAVA_ARGS="-Xmx64g -Xms8g -XX:MaxDirectMemorySize=64g"`

OS: centos 7

stardog.properties file in $STARDOG_HOME

```
index.statistics.update.automatic=false
index.named.graphs=false
memory.mode=bulk_load
```

Can I disable this feature? Thanks