It is working now. I reset my ".bash_profile" file. As I was thinking it was because of it.
Last login: Fri May 12 09:59:19 on ttys000
controller:~ mac$ cd documents
controller:documents mac$ cd elas*
controller:elasticsearch-5.4.0 mac$ ls
LICENSE.txt README.textile config modules
NOTICE.txt bin lib plugins
controller:elasticsearch-5.4.0 mac$ cd bin
controller:bin mac$ ls
elasticsearch elasticsearch-service.bat
elasticsearch-keystore elasticsearch-systemd-pre-exec
elasticsearch-keystore.bat elasticsearch-translog
elasticsearch-plugin elasticsearch-translog.bat
elasticsearch-plugin.bat elasticsearch.bat
elasticsearch-service-mgr.exe elasticsearch.in.bat
elasticsearch-service-x64.exe elasticsearch.in.sh
elasticsearch-service-x86.exe
controller:bin mac$ ./elasticsearch
[2017-05-12T10:11:04,197][INFO ][o.e.n.Node ] [] initializing ...
[2017-05-12T10:11:04,315][INFO ][o.e.e.NodeEnvironment ] [Is99LZf] using [1] data paths, mounts [[/ (/dev/disk1)]], net usable_space [6.1gb], net total_space [111.8gb], spins? [unknown], types [hfs]
[2017-05-12T10:11:04,316][INFO ][o.e.e.NodeEnvironment ] [Is99LZf] heap size [1.9gb], compressed ordinary object pointers [true]
[2017-05-12T10:11:04,317][INFO ][o.e.n.Node ] node name [Is99LZf] derived from node ID [Is99LZfXQrSPgJ5Tiyzv3Q]; set [node.name] to override
[2017-05-12T10:11:04,318][INFO ][o.e.n.Node ] version[5.4.0], pid[98636], build[780f8c4/2017-04-28T17:43:27.229Z], OS[Mac OS X/10.11.6/x86_64], JVM[Oracle Corporation/Java HotSpot(TM) 64-Bit Server VM/1.8.0_131/25.131-b11]
[2017-05-12T10:11:05,553][INFO ][o.e.p.PluginsService ] [Is99LZf] loaded module [aggs-matrix-stats]
[2017-05-12T10:11:05,553][INFO ][o.e.p.PluginsService ] [Is99LZf] loaded module [ingest-common]
[2017-05-12T10:11:05,554][INFO ][o.e.p.PluginsService ] [Is99LZf] loaded module [lang-expression]
[2017-05-12T10:11:05,554][INFO ][o.e.p.PluginsService ] [Is99LZf] loaded module [lang-groovy]
[2017-05-12T10:11:05,554][INFO ][o.e.p.PluginsService ] [Is99LZf] loaded module [lang-mustache]
[2017-05-12T10:11:05,554][INFO ][o.e.p.PluginsService ] [Is99LZf] loaded module [lang-painless]
[2017-05-12T10:11:05,554][INFO ][o.e.p.PluginsService ] [Is99LZf] loaded module [percolator]
[2017-05-12T10:11:05,555][INFO ][o.e.p.PluginsService ] [Is99LZf] loaded module [reindex]
[2017-05-12T10:11:05,555][INFO ][o.e.p.PluginsService ] [Is99LZf] loaded module [transport-netty3]
[2017-05-12T10:11:05,555][INFO ][o.e.p.PluginsService ] [Is99LZf] loaded module [transport-netty4]
[2017-05-12T10:11:05,556][INFO ][o.e.p.PluginsService ] [Is99LZf] no plugins loaded
[2017-05-12T10:11:08,039][INFO ][o.e.d.DiscoveryModule ] [Is99LZf] using discovery type [zen]
[2017-05-12T10:11:09,007][INFO ][o.e.n.Node ] initialized
[2017-05-12T10:11:09,007][INFO ][o.e.n.Node ] [Is99LZf] starting ...
[2017-05-12T10:11:09,327][INFO ][o.e.t.TransportService ] [Is99LZf] publish_address {127.0.0.1:9300}, bound_addresses {[fe80::1]:9300}, {[::1]:9300}, {127.0.0.1:9300}
[2017-05-12T10:11:12,415][INFO ][o.e.c.s.ClusterService ] [Is99LZf] new_master {Is99LZf}{Is99LZfXQrSPgJ5Tiyzv3Q}{t4iooNZCRBWh2HJl3xiP7Q}{127.0.0.1}{127.0.0.1:9300}, reason: zen-disco-elected-as-master ([0] nodes joined)
[2017-05-12T10:11:12,439][INFO ][o.e.h.n.Netty4HttpServerTransport] [Is99LZf] publish_address {127.0.0.1:9200}, bound_addresses {[fe80::1]:9200}, {[::1]:9200}, {127.0.0.1:9200}
[2017-05-12T10:11:12,444][INFO ][o.e.n.Node ] [Is99LZf] started
[2017-05-12T10:11:12,449][INFO ][o.e.g.GatewayService ] [Is99LZf] recovered [0] indices into cluster_state
[2017-05-12T10:11:42,433][WARN ][o.e.c.r.a.DiskThresholdMonitor] [Is99LZf] high disk watermark [90%] exceeded on [Is99LZfXQrSPgJ5Tiyzv3Q][Is99LZf [/Users/mac/documents/elasticsearch-5.4.0/data/nodes/0] free: 6.1gb[5.4%], shards will be relocated away from this node
[2017-05-12T10:11:42,433][INFO ][o.e.c.r.a.DiskThresholdMonitor] [Is99LZf] rerouting shards: [high disk watermark exceeded on one or more nodes]
Thank you for your help.