I have the /var/opt/graylog/data folder down to an acceptable level now. 
 The problem is that I am also at 98% usage on /.   I am assuming that this 
is currently the reason why the cluster still will not start.  Any 
suggestions?

root@graylog:/dev/graylog-vg# ls
data_LV  root  swap_1

Filesystem                       Size  Used Avail Use% Mounted on

/dev/mapper/graylog--vg-root      15G   14G  335M  98% /

none                             4.0K     0  4.0K   0% /sys/fs/cgroup

udev                             3.9G  4.0K  3.9G   1% /dev

tmpfs                            799M  488K  799M   1% /run

none                             5.0M     0  5.0M   0% /run/lock

none                             3.9G     0  3.9G   0% /run/shm

none                             100M     0  100M   0% /run/user

/dev/mapper/graylog--vg-data_LV  295G  215G   66G  77% /var/opt/graylog/data

/dev/sda1                        236M   38M  186M  18% /boot

On Wednesday, February 10, 2016 at 8:54:34 AM UTC-6, jeremys wrote:
>
> Two days ago, I noticed that my Elasticsearch cluster was unavailable. 
>  I've followed the suggestions provided in the setup documentation but I 
> still cannot get the cluster to turn green. 
>
> Graylog could not successfully connect to the Elasticsearch cluster. If 
> you're using multicast, check that it is working in your network and that 
> Elasticsearch is accessible. Also check that the cluster name setting is 
> correct. Read how to fix this in the Elasticsearch setup documentation. 
> <http://docs.graylog.org/en/1.3/pages/configuring_es.html#configuration>
>
> No changes were made between the time it was working and when it stopped 
> working.  Any help would be greatly appreciated.  Thank you
>
> *Graylog Config*
> # If you are running more than one instances of graylog-server you have to 
> select one of these
> # instances as master. The master will perform some periodical tasks that 
> non-masters won't perform.
> is_master = true
>
> # The auto-generated node ID will be stored in this file and read after 
> restarts. It is a good idea
> # to use an absolute file path here if you are starting graylog-server 
> from init scripts or similar.
> node_id_file = /var/opt/graylog/graylog-server-node-id
>
> # You MUST set a secret to secure/pepper the stored user passwords here. 
> Use at least 64 characters.
> # Generate one by using for example: pwgen -N 1 -s 96
> password_secret = mypassword
>
> # the default root user is named 'admin'
> root_username = myusername
>
> # You MUST specify a hash password for the root user (which you only need 
> to initially set up the
> # system and in case you lose connectivity to your authentication backend)
> # This password cannot be changed using the API or via the web interface. 
> If you need to change it,
> # modify it in this file.
> # Create one by using for example: echo -n yourpassword | shasum -a 256
> # and put the resulting hash value into the following line
> root_password_sha2 = mypassword
>
> # The email address of the root user.
> # Default is empty
> #root_email = ""
>
> # The time zone setting of the root user.
> # Default is UTC
> root_timezone = America/Chicago
>
> # Set plugin directory here (relative or absolute)
> plugin_dir = /opt/graylog/plugin
>
> # REST API listen URI. Must be reachable by other graylog-server nodes if 
> you run a cluster.
> rest_listen_uri = http://0.0.0.0:12900/
>
> # REST API transport address. Defaults to the value of rest_listen_uri. 
> Exception: If rest_listen_uri
> # is set to a wildcard IP address (0.0.0.0) the first non-loopback IPv4 
> system address is used.
> # If set, his will be promoted in the cluster discovery APIs, so other 
> nodes may try to connect on
> # this address and it is used to generate URLs addressing entities in the 
> REST API. (see rest_listen_uri)
> # You will need to define this, if your Graylog server is running behind a 
> HTTP proxy that is rewriting
> # the scheme, host name or URI.
> #rest_transport_uri = http://192.168.1.1:12900/
>
> # Enable CORS headers for REST api. This is necessary for JS-clients 
> accessing the server directly.
> # If these are disabled, modern browsers will not be able to retrieve 
> resources from the server.
> # This is disabled by default. Uncomment the next line to enable it.
> #rest_enable_cors = true
>
> # Enable GZIP support for REST api. This compresses API responses and 
> therefore helps to reduce
> # overall round trip times. This is disabled by default. Uncomment the 
> next line to enable it.
> #rest_enable_gzip = true
>
> # Enable HTTPS support for the REST API. This secures the communication 
> with the REST API with
> # TLS to prevent request forgery and eavesdropping. This is disabled by 
> default. Uncomment the
> # next line to enable it.
> #rest_enable_tls = true
>
> # The X.509 certificate file to use for securing the REST API.
> #rest_tls_cert_file = /path/to/graylog2.crt
>
> # The private key to use for securing the REST API.
> #rest_tls_key_file = /path/to/graylog2.key
>
> # The password to unlock the private key used for securing the REST API.
> #rest_tls_key_password = secret
>
> # The maximum size of a single HTTP chunk in bytes.
> #rest_max_chunk_size = 8192
>
> # The maximum size of the HTTP request headers in bytes.
> #rest_max_header_size = 8192
>
> # The maximal length of the initial HTTP/1.1 line in bytes.
> #rest_max_initial_line_length = 4096
>
> # The size of the execution handler thread pool used exclusively for 
> serving the REST API.
> #rest_thread_pool_size = 16
>
> # The size of the worker thread pool used exclusively for serving the REST 
> API.
> #rest_worker_threads_max_pool_size = 16
>
> # Embedded Elasticsearch configuration file
> # pay attention to the working directory of the server, maybe use an 
> absolute path here
> #elasticsearch_config_file = /etc/graylog-elasticsearch.yml
>
>
> # Graylog will use multiple indices to store documents in. You can 
> configured the strategy it uses to determine
> # when to rotate the currently active write index.
> # It supports multiple rotation strategies:
> #   - "count" of messages per index, use elasticsearch_max_docs_per_index 
> below to configure
> #   - "size" per index, use elasticsearch_max_size_per_index below to 
> configure
> # valid values are "count", "size" and "time", default is "count"
> rotation_strategy = size
>
> # (Approximate) maximum number of documents in an Elasticsearch index 
> before a new index
> # is being created, also see no_retention and 
> elasticsearch_max_number_of_indices.
> # Configure this if you used 'rotation_strategy = count' above.
> #elasticsearch_max_docs_per_index = 20000000
>
> # (Approximate) maximum size in bytes per Elasticsearch index on disk 
> before a new index is being created, also see
> # no_retention and elasticsearch_max_number_of_indices. Default is 1GB.
> # Configure this if you used 'rotation_strategy = size' above.
> elasticsearch_max_size_per_index = 5368709120
>
> # (Approximate) maximum time before a new Elasticsearch index is being 
> created, also see
> # no_retention and elasticsearch_max_number_of_indices. Default is 1 day.
> # Configure this if you used 'rotation_strategy = time' above.
> # Please note that this rotation period does not look at the time 
> specified in the received messages, but is
> # using the real clock value to decide when to rotate the index!
> # Specify the time using a duration and a suffix indicating which unit you 
> want:
> #  1w  = 1 week
> #  1d  = 1 day
> #  12h = 12 hours
> # Permitted suffixes are: d for day, h for hour, m for minute, s for 
> second.
> elasticsearch_max_time_per_index = 1h
>
> # Disable checking the version of Elasticsearch for being compatible with 
> this Graylog release.
> # WARNING: Using Graylog with unsupported and untested versions of 
> Elasticsearch may lead to data loss!
> #elasticsearch_disable_version_check = true
>
> # Disable message retention on this node, i. e. disable Elasticsearch 
> index rotation.
> #no_retention = false
>
> # How many indices do you want to keep?
> elasticsearch_max_number_of_indices = 50
>
> # Decide what happens with the oldest indices when the maximum number of 
> indices is reached.
> # The following strategies are availble:
> #   - delete # Deletes the index completely (Default)
> #   - close # Closes the index and hides it from the system. Can be 
> re-opened later.
> retention_strategy = delete
>
> # How many Elasticsearch shards and replicas should be used per index? 
> Note that this only applies to newly created indices.
> elasticsearch_shards = 4
> elasticsearch_replicas = 1
>
> # Prefix for all Elasticsearch indices and index aliases managed by 
> Graylog.
> elasticsearch_index_prefix = graylog
>
> # Do you want to allow searches with leading wildcards? This can be 
> extremely resource hungry and should only
> # be enabled with care. See also: 
> http://graylog2.org/resources/documentation/general/queries
> allow_leading_wildcard_searches = true
>
> # Do you want to allow searches to be highlighted? Depending on the size 
> of your messages this can be memory hungry and
> # should only be enabled after making sure your Elasticsearch cluster has 
> enough memory.
> allow_highlighting = false
>
> # settings to be passed to elasticsearch's client (overriding those in the 
> provided elasticsearch_config_file)
> # all these
> # this must be the same as for your Elasticsearch cluster
> elasticsearch_cluster_name = graylog2
>
> # you could also leave this out, but makes it easier to identify the 
> graylog client instance
> #elasticsearch_node_name = graylog-server
>
> # we don't want the graylog server to store any data, or be master node
> #elasticsearch_node_master = false
> #elasticsearch_node_data = false
>
> # use a different port if you run multiple Elasticsearch nodes on one 
> machine
> #elasticsearch_transport_tcp_port = 9350
>
> # we don't need to run the embedded HTTP server here
> elasticsearch_http_enabled = false
>
> #elasticsearch_discovery_zen_ping_multicast_enabled = false
> elasticsearch_discovery_zen_ping_unicast_hosts = MyserverIP:9300
>
> # Change the following setting if you are running into problems with 
> timeouts during Elasticsearch cluster discovery.
> # The setting is specified in milliseconds, the default is 5000ms (5 
> seconds).
> elasticsearch_cluster_discovery_timeout = 5000
>
> # the following settings allow to change the bind addresses for the 
> Elasticsearch client in graylog
> # these settings are empty by default, letting Elasticsearch choose 
> automatically,
> # override them here or in the 'elasticsearch_config_file' if you need to 
> bind to a special address
> # refer to 
> http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.3/modules-network.html
> # for special values here
> # elasticsearch_network_host =
> # elasticsearch_network_bind_host =
> # elasticsearch_network_publish_host =
>
> # The total amount of time discovery will look for other Elasticsearch 
> nodes in the cluster
> # before giving up and declaring the current node master.
> elasticsearch_discovery_initial_state_timeout = 3s
>
> # Analyzer (tokenizer) to use for message and full_message field. The 
> "standard" filter usually is a good idea.
> # All supported analyzers are: standard, simple, whitespace, stop, 
> keyword, pattern, language, snowball, custom
> # Elasticsearch documentation: 
> http://www.elasticsearch.org/guide/reference/index-modules/analysis/
> # Note that this setting only takes effect on newly created indices.
> elasticsearch_analyzer = standard
>
> # Global request timeout for Elasticsearch requests (e. g. during search, 
> index creation, or index time-range
> # calculations) based on a best-effort to restrict the runtime of 
> Elasticsearch operations.
> # Default: 1m
> #elasticsearch_request_timeout = 1m
>
> # Batch size for the Elasticsearch output. This is the maximum (!) number 
> of messages the Elasticsearch output
> # module will get at once and write to Elasticsearch in a batch call. If 
> the configured batch size has not been
> # reached within output_flush_interval seconds, everything that is 
> available will be flushed at once. Remember
> # that every outputbuffer processor manages its own batch and performs its 
> own batch write calls.
> # ("outputbuffer_processors" variable)
> output_batch_size = 500
>
> # Flush interval (in seconds) for the Elasticsearch output. This is the 
> maximum amount of time between two
> # batches of messages written to Elasticsearch. It is only effective at 
> all if your minimum number of messages
> # for this time period is less than output_batch_size * 
> outputbuffer_processors.
> output_flush_interval = 1
>
> # As stream outputs are loaded only on demand, an output which is failing 
> to initialize will be tried over and
> # over again. To prevent this, the following configuration options define 
> after how many faults an output will
> # not be tried again for an also configurable amount of seconds.
> output_fault_count_threshold = 5
> output_fault_penalty_seconds = 30
>
> # The number of parallel running processors.
> # Raise this number if your buffers are filling up.
> processbuffer_processors = 5
> outputbuffer_processors = 3
>
> #outputbuffer_processor_keep_alive_time = 5000
> #outputbuffer_processor_threads_core_pool_size = 3
> #outputbuffer_processor_threads_max_pool_size = 30
>
> # UDP receive buffer size for all message inputs (e. g. SyslogUDPInput).
> #udp_recvbuffer_sizes = 1048576
>
> # Wait strategy describing how buffer processors wait on a cursor 
> sequence. (default: sleeping)
> # Possible types:
> #  - yielding
> #     Compromise between performance and CPU usage.
> #  - sleeping
> #     Compromise between performance and CPU usage. Latency spikes can 
> occur after quiet periods.
> #  - blocking
> #     High throughput, low latency, higher CPU usage.
> #  - busy_spinning
> #     Avoids syscalls which could introduce latency jitter. Best when 
> threads can be bound to specific CPU cores.
> processor_wait_strategy = blocking
>
> # Size of internal ring buffers. Raise this if raising 
> outputbuffer_processors does not help anymore.
> # For optimum performance your LogMessage objects in the ring buffer 
> should fit in your CPU L3 cache.
> # Start server with --statistics flag to see buffer utilization.
> # Must be a power of 2. (512, 1024, 2048, ...)
> ring_size = 65536
>
> inputbuffer_ring_size = 65536
> inputbuffer_processors = 2
> inputbuffer_wait_strategy = blocking
>
> # Enable the disk based message journal.
> message_journal_enabled = true
>
> # The directory which will be used to store the message journal. The 
> directory must me exclusively used by Graylog and
> # must not contain any other files than the ones created by Graylog itself.
> message_journal_dir = /var/opt/graylog/data/journal
>
> # Journal hold messages before they could be written to Elasticsearch.
> # For a maximum of 12 hours or 5 GB whichever happens first.
> # During normal operation the journal will be smaller.
> #message_journal_max_age = 12h
> message_journal_max_size = 1gb
>
> #message_journal_flush_age = 1m
> #message_journal_flush_interval = 1000000
> #message_journal_segment_age = 1h
> #message_journal_segment_size = 100mb
>
> # Number of threads used exclusively for dispatching internal events. 
> Default is 2.
> async_eventbus_processors = 2
>
> # EXPERIMENTAL: Dead Letters
> # Every failed indexing attempt is logged by default and made visible in 
> the web-interface. You can enable
> # the experimental dead letters feature to write every message that was 
> not successfully indexed into the
> # MongoDB "dead_letters" collection to make sure that you never lose a 
> message. The actual writing of dead
> # letter should work fine already but it is not heavily tested yet and 
> will get more features in future
> # releases.
> dead_letters_enabled = false
>
> # How many seconds to wait between marking node as DEAD for possible load 
> balancers and starting the actual
> # shutdown process. Set to 0 if you have no status checking load balancers 
> in front.
> lb_recognition_period_seconds = 3
>
> # Every message is matched against the configured streams and it can 
> happen that a stream contains rules which
> # take an unusual amount of time to run, for example if its using regular 
> expressions that perform excessive backtracking.
> # This will impact the processing of the entire server. To keep such 
> misbehaving stream rules from impacting other
> # streams, Graylog limits the execution time for each stream.
> # The default values are noted below, the timeout is in milliseconds.
> # If the stream matching for one stream took longer than the timeout 
> value, and this happened more than "max_faults" times
> # that stream is disabled and a notification is shown in the web interface.
> # stream_processing_timeout = 2000
> # stream_processing_max_faults = 3
>
> # Length of the interval in seconds in which the alert conditions for all 
> streams should be checked
> # and alarms are being sent.
> alert_check_interval = 60
>
> # Since 0.21 the graylog server supports pluggable output modules. This 
> means a single message can be written to multiple
> # outputs. The next setting defines the timeout for a single output 
> module, including the default output module where all
> # messages end up. This setting is specified in milliseconds.
>
> # Time in milliseconds to wait for all message outputs to finish writing a 
> single message.
> #output_module_timeout = 10000
>
> # Time in milliseconds after which a detected stale master node is being 
> rechecked on startup.
> #stale_master_timeout = 2000
>
> # Time in milliseconds which Graylog is waiting for all threads to stop on 
> shutdown.
> # shutdown_timeout = 30000
>
> # MongoDB Configuration
> mongodb_uri = mongodb://127.0.0.1:27017/graylog
>
> # Raise this according to the maximum connections your MongoDB server can 
> handle if you encounter MongoDB connection problems.
> mongodb_max_connections = 100
>
> # Number of threads allowed to be blocked by MongoDB connections 
> multiplier. Default: 5
> # If mongodb_max_connections is 100, and 
> mongodb_threads_allowed_to_block_multiplier is 5, then 500 threads can 
> block. More than that and an exception will be thrown.
> # 
> http://api.mongodb.org/java/current/com/mongodb/MongoOptions.html#threadsAllowedToBlockForConnectionMultiplier
> mongodb_threads_allowed_to_block_multiplier = 5
>
> # Drools Rule File (Use to rewrite incoming log messages)
> # See: http://graylog2.org/resources/documentation/general/rewriting
>
> # Email transport
> transport_email_enabled = false
> transport_email_hostname =
> transport_email_port = 587
> transport_email_use_auth = false
> transport_email_use_tls = true
> transport_email_use_ssl = true
> transport_email_auth_username =
> transport_email_auth_password =
> transport_email_subject_prefix = [graylog]
> transport_email_from_email =
>
> # Specify and uncomment this if you want to include links to the stream in 
> your stream alert mails.
> # This should define the fully qualified base url to your web interface 
> exactly the same way as it is accessed by your users.
> #
> transport_email_web_interface_url =
>
> # The default connect timeout for outgoing HTTP connections.
> # Values must be a positive duration (and between 1 and 2147483647 when 
> converted to milliseconds).
> # Default: 5s
> #http_connect_timeout = 5s
>
> # The default read timeout for outgoing HTTP connections.
> # Values must be a positive duration (and between 1 and 2147483647 when 
> converted to milliseconds).
> # Default: 10s
> #http_read_timeout = 10s
>
> # The default write timeout for outgoing HTTP connections.
> # Values must be a positive duration (and between 1 and 2147483647 when 
> converted to milliseconds).
> # Default: 10s
> #http_write_timeout = 10s
>
> # HTTP proxy for outgoing HTTP calls
>
> # Disable the optimization of Elasticsearch indices after index cycling. 
> This may take some load from Elasticsearch
> # on heavily used systems with large indices, but it will decrease search 
> performance. The default is to optimize
> # cycled indices.
> #disable_index_optimization = true
>
> # Optimize the index down to <= index_optimization_max_num_segments. A 
> higher number may take some load from Elasticsearch
> # on heavily used systems with large indices, but it will decrease search 
> performance. The default is 1.
> #index_optimization_max_num_segments = 1
>
> # Disable the index range calculation on all open/available indices and 
> only calculate the range for the latest
> # index. This may speed up index cycling on systems with large indices but 
> it might lead to wrong search results
> # in regard to the time range of the messages (i. e. messages within a 
> certain range may not be found). The default
> # is to calculate the time range on all open/available indices.
> #disable_index_range_calculation = true
>
> # The threshold of the garbage collection runs. If GC runs take longer 
> than this threshold, a system notification
> # will be generated to warn the administrator about possible problems with 
> the system. Default is 1 second.
> #gc_warning_threshold = 1s
>
> # Connection timeout for a configured LDAP server (e. g. ActiveDirectory) 
> in milliseconds.
> #ldap_connection_timeout = 2000
>
> # Enable collection of Graylog-related metrics into MongoDB
> #enable_metrics_collection = false
>
> # Disable the use of SIGAR for collecting system stats
> #disable_sigar = false
>
> # Amount of time of inactivity after which collectors are flagged as 
> inactive (Default: 1 minute)
> #collector_inactive_threshold = 1m
>
> # Amount of time after which inactive collectors are purged (Default: 14 
> days)
> #collector_expiration_threshold = 14d
>
> # The default cache time for dashboard widgets. (Default: 10 seconds, 
> minimum: 1 second)
> dashboard_widget_default_cache_time = 10s
>
> # Automatically load content packs in "content_packs_dir" on the first 
> start of Graylog.
> content_packs_loader_enabled = true
>
> # The directory which contains content packs which should be loaded on the 
> first start of Graylog.
> content_packs_dir = /opt/graylog/contentpacks
>
> # A comma-separated list of content packs (files in "content_packs_dir") 
> which should be applied on
> # the first start of Graylog.
> content_packs_auto_load = grok-patterns.json,content_pack_appliance.json
>
>
> *Elasticsearch config*
> ##################### Elasticsearch Configuration Example 
> #####################
>
> # This file contains an overview of various configuration settings,
> # targeted at operations staff. Application developers should
> # consult the guide at <http://elasticsearch.org/guide>.
> #
> # The installation procedure is covered at
> # <
> http://elasticsearch.org/guide/en/elasticsearch/reference/current/setup.html
> >.
> #
> # Elasticsearch comes with reasonable defaults for most settings,
> # so you can try it out without bothering with configuration.
> #
> # Most of the time, these defaults are just fine for running a production
> # cluster. If you're fine-tuning your cluster, or wondering about the
> # effect of certain configuration option, please _do ask_ on the
> # mailing list or IRC channel [http://elasticsearch.org/community].
>
> # Any element in the configuration can be replaced with environment 
> variables
> # by placing them in ${...} notation. For example:
> #
> #node.rack: ${RACK_ENV_VAR}
>
> # For information on supported formats and syntax for the config file, see
> # <
> http://elasticsearch.org/guide/en/elasticsearch/reference/current/setup-configuration.html
> >
>
>
> ################################### Cluster 
> ###################################
>
> # Cluster name identifies your cluster for auto-discovery. If you're 
> running
> # multiple clusters on the same network, make sure you're using unique 
> names.
> #
> #cluster.name: elasticsearch
>
>
> #################################### Node 
> #####################################
>
> # Node names are generated dynamically on startup, so you're relieved
> # from configuring them manually. You can tie this node to a specific name:
> #
> #node.name: "Franz Kafka"
>
> # Every node can be configured to allow or deny being eligible as the 
> master,
> # and to allow or deny to store the data.
> #
> # Allow this node to be eligible as a master node (enabled by default):
> #
> #node.master: true
> #
> # Allow this node to store data (enabled by default):
> #
> #node.data: true
>
> # You can exploit these settings to design advanced cluster topologies.
> #
> # 1. You want this node to never become a master node, only to hold data.
> #    This will be the "workhorse" of your cluster.
> #
> #node.master: false
> #node.data: true
> #
> # 2. You want this node to only serve as a master: to not store any data 
> and
> #    to have free resources. This will be the "coordinator" of your 
> cluster.
> #
> #node.master: true
> #node.data: false
> #
> # 3. You want this node to be neither master nor data node, but
> #    to act as a "search load balancer" (fetching data from nodes,
> #    aggregating results, etc.)
> #
> #node.master: false
> #node.data: false
>
> # Use the Cluster Health API [http://localhost:9200/_cluster/health], the
> # Node Info API [http://localhost:9200/_nodes] or GUI tools
> # such as <http://www.elasticsearch.org/overview/marvel/>,
> # <http://github.com/karmi/elasticsearch-paramedic>,
> # <http://github.com/lukas-vlcek/bigdesk> and
> # <http://mobz.github.com/elasticsearch-head> to inspect the cluster 
> state.
>
> # A node can have generic attributes associated with it, which can later 
> be used
> # for customized shard allocation filtering, or allocation awareness. An 
> attribute
> # is a simple key value pair, similar to node.key: value, here is an 
> example:
> #
> #node.rack: rack314
>
> # By default, multiple nodes are allowed to start from the same 
> installation location
> # to disable it, set the following:
> #node.max_local_storage_nodes: 1
>
>
> #################################### Index 
> ####################################
>
> # You can set a number of options (such as shard/replica options, mapping
> # or analyzer definitions, translog settings, ...) for indices globally,
> # in this file.
> #
> # Note, that it makes more sense to configure index settings specifically 
> for
> # a certain index, either when creating it or by using the index templates 
> API.
> #
> # See <
> http://elasticsearch.org/guide/en/elasticsearch/reference/current/index-modules.html>
>  
> and
> # <
> http://elasticsearch.org/guide/en/elasticsearch/reference/current/indices-create-index.html
> >
> # for more information.
>
> # Set the number of shards (splits) of an index (5 by default):
> #
> #index.number_of_shards: 5
>
> # Set the number of replicas (additional copies) of an index (1 by 
> default):
> #
> #index.number_of_replicas: 1
>
> # Note, that for development on a local machine, with small indices, it 
> usually
> # makes sense to "disable" the distributed features:
> #
> #index.number_of_shards: 1
> #index.number_of_replicas: 0
>
> # These settings directly affect the performance of index and search 
> operations
> # in your cluster. Assuming you have enough machines to hold shards and
> # replicas, the rule of thumb is:
> #
> # 1. Having more *shards* enhances the _indexing_ performance and allows to
> #    _distribute_ a big index across machines.
> # 2. Having more *replicas* enhances the _search_ performance and improves 
> the
> #    cluster _availability_.
> #
> # The "number_of_shards" is a one-time setting for an index.
> #
> # The "number_of_replicas" can be increased or decreased anytime,
> # by using the Index Update Settings API.
> #
> # Elasticsearch takes care about load balancing, relocating, gathering the
> # results from nodes, etc. Experiment with different settings to fine-tune
> # your setup.
>
> # Use the Index Status API (<http://localhost:9200/A/_status>) to inspect
> # the index status.
>
>
> #################################### Paths 
> ####################################
>
> # Path to directory containing configuration (this file and logging.yml):
> #
> #path.conf: /path/to/conf
>
> # Path to directory where to store index data allocated for this node.
> #
> #path.data: /path/to/data
> #
> # Can optionally include more than one location, causing data to be 
> striped across
> # the locations (a la RAID 0) on a file level, favouring locations with 
> most free
> # space on creation. For example:
> #
> #path.data: /path/to/data1,/path/to/data2
>
> # Path to temporary files:
> #
> #path.work: /path/to/work
>
> # Path to log files:
> #
> #path.logs: /path/to/logs
>
> # Path to where plugins are installed:
> #
> #path.plugins: /path/to/plugins
>
>
> #################################### Plugin 
> ###################################
>
> # If a plugin listed here is not installed for current node, the node will 
> not start.
> #
> #plugin.mandatory: mapper-attachments,lang-groovy
>
>
> ################################### Memory 
> ####################################
>
> # Elasticsearch performs poorly when JVM starts swapping: you should 
> ensure that
> # it _never_ swaps.
> #
> # Set this property to true to lock the memory:
> #
> #bootstrap.mlockall: true
>
> # Make sure that the ES_MIN_MEM and ES_MAX_MEM environment variables are 
> set
> # to the same value, and that the machine has enough memory to allocate
> # for Elasticsearch, leaving enough memory for the operating system itself.
> #
> # You should also make sure that the Elasticsearch process is allowed to 
> lock
> # the memory, eg. by using `ulimit -l unlimited`.
>
>
> ############################## Network And HTTP 
> ###############################
>
> # Elasticsearch, by default, binds itself to the 0.0.0.0 address, and 
> listens
> # on port [9200-9300] for HTTP traffic and on port [9300-9400] for 
> node-to-node
> # communication. (the range means that if the port is busy, it will 
> automatically
> # try the next port).
>
> # Set the bind address specifically (IPv4 or IPv6):
> #
> #network.bind_host: 192.168.0.1
>
> # Set the address other nodes will use to communicate with this node. If 
> not
> # set, it is automatically derived. It must point to an actual IP address.
> #
> #network.publish_host: 192.168.0.1
> ...

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