consul watch handler runs multiple times when changing a key

[giladsh1]

I'm running Consul v1.1.0.
here is the consul info output -

agent:
	check_monitors = 0
	check_ttls = 0
	checks = 0
	services = 0
build:
	prerelease =
	revision = 5174058f
	version = 1.1.0
consul:
	known_servers = 3
	server = false
runtime:
	arch = amd64
	cpu_count = 2
	goroutines = 157
	max_procs = 2
	os = linux
	version = go1.10.1
serf_lan:
	coordinate_resets = 0
	encrypted = true
	event_queue = 0
	event_time = 2
	failed = 0
	health_score = 0
	intent_queue = 0
	left = 0
	member_time = 5
	members = 4
	query_queue = 0
	query_time = 1

I've created the following configuration for watching a key -

$>  cat /etc/consul.d/check.json
{
  "watches": [
    {
      "type": "key",
      "key": "environments/config/daniel/traps_version",
      "handler_type": "script",
      "args": ["sh", "-c", "/tmp/test.sh"]
    }
  ]
}

when changing the key "environments/config/daniel/traps_version", the agent gets the key and runs the script multiple times.
here is a part of the log file -

2018/05/30 15:06:59 [DEBUG] http: Request GET /v1/kv/environments/config/daniel/traps_version?index=188358 (7.079140117s) from=127.0.0.1:49467
    2018/05/30 15:06:59 [DEBUG] http: Request GET /v1/kv/environments/config/daniel/traps_version?index=188358 (7.080088558s) from=127.0.0.1:49469
    2018/05/30 15:06:59 [DEBUG] http: Request GET /v1/kv/environments/config/daniel/traps_version?index=188358 (7.08265912s) from=127.0.0.1:49475
    2018/05/30 15:06:59 [DEBUG] http: Request GET /v1/kv/environments/config/daniel/traps_version?index=188358 (7.086552636s) from=127.0.0.1:49461
    2018/05/30 15:06:59 [DEBUG] http: Request GET /v1/kv/environments/config/daniel/traps_version?index=188358 (7.089281657s) from=127.0.0.1:49459
    2018/05/30 15:06:59 [DEBUG] http: Request GET /v1/kv/environments/config/daniel/traps_version?index=188358 (7.080948755s) from=127.0.0.1:49471
    2018/05/30 15:06:59 [DEBUG] http: Request GET /v1/kv/environments/config/daniel/traps_version?index=188358 (7.089535884s) from=127.0.0.1:49463
    2018/05/30 15:06:59 [DEBUG] http: Request GET /v1/kv/environments/config/daniel/traps_version?index=188358 (7.094883838s) from=127.0.0.1:49465
    2018/05/30 15:06:59 [DEBUG] http: Request GET /v1/kv/environments/config/daniel/traps_version?index=188358 (7.093992461s) from=127.0.0.1:49473
    2018/05/30 15:06:59 [DEBUG] agent: watch handler '[sh -c /tmp/test.sh]' output:
    2018/05/30 15:06:59 [DEBUG] agent: watch handler '[sh -c /tmp/test.sh]' output:
    2018/05/30 15:06:59 [DEBUG] agent: watch handler '[sh -c /tmp/test.sh]' output:
    2018/05/30 15:06:59 [DEBUG] agent: watch handler '[sh -c /tmp/test.sh]' output:
    2018/05/30 15:06:59 [DEBUG] agent: watch handler '[sh -c /tmp/test.sh]' output:
    2018/05/30 15:06:59 [DEBUG] agent: watch handler '[sh -c /tmp/test.sh]' output:
    2018/05/30 15:06:59 [DEBUG] agent: watch handler '[sh -c /tmp/test.sh]' output:
    2018/05/30 15:06:59 [DEBUG] agent: watch handler '[sh -c /tmp/test.sh]' output:
    2018/05/30 15:06:59 [DEBUG] agent: watch handler '[sh -c /tmp/test.sh]' output:

it's important to note that this error does not happen when running watch from the command line - the script only runs once.

here is my consul.json config file -

{
  "addresses": {
    "dns": "0.0.0.0",
    "http": "0.0.0.0"
  },
  "dns_config": {
    "node_ttl": "1s",
    "service_ttl": {
      "*": "1s"
    },
    "allow_stale": true,
    "max_stale": "5s"
  },
  "enable_script_checks": true,
  "disable_host_node_id": true,
  "log_level": "trace",
  "enable_syslog": false,
  "syslog_facility": "LOCAL3",
  "rejoin_after_leave": true,
  "skip_leave_on_interrupt": false,
  "disable_remote_exec": false,
  "check_update_interval": "5m",
  "enable_debug": false,
  "node_meta": {
    "instance_type": "t2.medium"
  },
  "limits": {
    "rpc_max_burst": 1000,
    "rpc_rate": -1
  },
  "data_dir": "/var/lib/consul",
  "retry_join": ["provider=aws tag_key=Role tag_value=<tag>"],
  "bind_addr": "<lan-ip>",
  "datacenter": "dc1",
  "node_name": "node",
  "ports": {
    "dns": 8600,
    "http": 8500,
    "serf_lan": 8301,
    "serf_wan": 8302,
    "server": 8300
  },
  "encrypt": "encrypt-key"
}