Adds cluster API example requests and responses.

Author: szabosteve

specification/cluster/allocation_explain/clusterAllocationExplainRequestExample1.json

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+{
+  "summary": "Provides an explanation for a shard’s current allocation.",
+  "method_request": "GET _cluster/allocation/explain",
+  "description": "",
+  "type": "request",
+  "value": "{\n  \"index\": \"my-index-000001\",\n  \"shard\": 0,\n  \"primary\": false,\n  \"current_node\": \"my-node\"\n}"
+}

specification/cluster/health/clusterHealthResponseExample1.json

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+{
+  "summary": "A successful response when requesting the health status of a cluster.",
+  "description": "This is the API response in case of a quiet single node cluster with a single index with one shard and one replica.",
+  "type": "response",
+  "response_code": 200,
+  "value": "{\n  \"cluster_name\" : \"testcluster\",\n  \"status\" : \"yellow\",\n  \"timed_out\" : false,\n  \"number_of_nodes\" : 1,\n  \"number_of_data_nodes\" : 1,\n  \"active_primary_shards\" : 1,\n  \"active_shards\" : 1,\n  \"relocating_shards\" : 0,\n  \"initializing_shards\" : 0,\n  \"unassigned_shards\" : 1,\n  \"delayed_unassigned_shards\": 0,\n  \"number_of_pending_tasks\" : 0,\n  \"number_of_in_flight_fetch\": 0,\n  \"task_max_waiting_in_queue_millis\": 0,\n  \"active_shards_percent_as_number\": 50.0\n}"
+}

specification/cluster/put_settings/clusterPutSettingsRequestExample1.json

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+{
+  "summary": "Configures dynamic cluster settings.",
+  "method_request": "PUT /_cluster/settings",
+  "description": "An example of a persistent update.",
+  "type": "request",
+  "value": "{\n  \"persistent\" : {\n    \"indices.recovery.max_bytes_per_sec\" : \"50mb\"\n  }\n}"
+}

specification/cluster/reroute/clusterRerouteRequestExample1.json

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+{
+  "summary": "Changes the allocation of shards in a cluster.",
+  "method_request": "POST /_cluster/reroute?metric=none",
+  "description": "",
+  "type": "request",
+  "value": "{\n  \"commands\": [\n    {\n      \"move\": {\n        \"index\": \"test\", \"shard\": 0,\n        \"from_node\": \"node1\", \"to_node\": \"node2\"\n      }\n    },\n    {\n      \"allocate_replica\": {\n        \"index\": \"test\", \"shard\": 1,\n        \"node\": \"node3\"\n      }\n    }\n  ]\n}"
+}

specification/nodes/info/nodesInfoResponseExample1.json

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+{
+  "summary": "A successful response when requesting cluster nodes information.",
+  "description": "",
+  "type": "response",
+  "response_code": 200,
+  "value": "{\n  \"_nodes\": ...\n  \"cluster_name\": \"elasticsearch\",\n  \"nodes\": {\n    \"USpTGYaBSIKbgSUJR2Z9lg\": {\n      \"name\": \"node-0\",\n      \"transport_address\": \"192.168.17:9300\",\n      \"host\": \"node-0.elastic.co\",\n      \"ip\": \"192.168.17\",\n      \"version\": \"{version}\",\n      \"transport_version\": 100000298,\n      \"index_version\": 100000074,\n      \"component_versions\": {\n        \"ml_config_version\": 100000162,\n        \"transform_config_version\": 100000096\n      },\n      \"build_flavor\": \"default\",\n      \"build_type\": \"{build_type}\",\n      \"build_hash\": \"587409e\",\n      \"roles\": [\n        \"master\",\n        \"data\",\n        \"ingest\"\n      ],\n      \"attributes\": {},\n      \"plugins\": [\n        {\n          \"name\": \"analysis-icu\",\n          \"version\": \"{version}\",\n          \"description\": \"The ICU Analysis plugin integrates Lucene ICU module into elasticsearch, adding ICU relates analysis components.\",\n          \"classname\": \"org.elasticsearch.plugin.analysis.icu.AnalysisICUPlugin\",\n          \"has_native_controller\": false\n        }\n      ],\n      \"modules\": [\n        {\n          \"name\": \"lang-painless\",\n          \"version\": \"{version}\",\n          \"description\": \"An easy, safe and fast scripting language for Elasticsearch\",\n          \"classname\": \"org.elasticsearch.painless.PainlessPlugin\",\n          \"has_native_controller\": false\n        }\n      ]\n    }\n  }\n}"
+}

specification/nodes/reload_secure_settings/clusterNodesReloadSecureSettingsRequestExample1.json

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+{
+  "summary": "Reloads the keystore on nodes in the cluster.",
+  "method_request": "POST _nodes/reload_secure_settings",
+  "description": "",
+  "type": "request",
+  "value": "{\n  \"secure_settings_password\":\"keystore-password\"\n}"
+}

specification/nodes/reload_secure_settings/clusterNodesReloadSecureSettingsResponseExample1.json

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+{
+  "summary": "A successful response when reloading keystore on nodes in your cluster.",
+  "description": "",
+  "type": "response",
+  "response_code": 200,
+  "value": "{\n  \"_nodes\": {\n    \"total\": 1,\n    \"successful\": 1,\n    \"failed\": 0\n  },\n  \"cluster_name\": \"my_cluster\",\n  \"nodes\": {\n    \"pQHNt5rXTTWNvUgOrdynKg\": {\n      \"name\": \"node-0\"\n    }\n  }\n}"
+}

specification/tasks/get/getTasksResponseExample1.json

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+{
+  "summary": "A successful response when requesting information about the tasks currently executing in the cluster.",
+  "description": "",
+  "type": "response",
+  "response_code": "",
+  "value": "{\n  \"nodes\" : {\n    \"oTUltX4IQMOUUVeiohTt8A\" : {\n      \"name\" : \"H5dfFeA\",\n      \"transport_address\" : \"127.0.0.1:9300\",\n      \"host\" : \"127.0.0.1\",\n      \"ip\" : \"127.0.0.1:9300\",\n      \"tasks\" : {\n        \"oTUltX4IQMOUUVeiohTt8A:124\" : {\n          \"node\" : \"oTUltX4IQMOUUVeiohTt8A\",\n          \"id\" : 124,\n          \"type\" : \"direct\",\n          \"action\" : \"cluster:monitor/tasks/lists[n]\",\n          \"start_time_in_millis\" : 1458585884904,\n          \"running_time_in_nanos\" : 47402,\n          \"cancellable\" : false,\n          \"parent_task_id\" : \"oTUltX4IQMOUUVeiohTt8A:123\"\n        },\n        \"oTUltX4IQMOUUVeiohTt8A:123\" : {\n          \"node\" : \"oTUltX4IQMOUUVeiohTt8A\",\n          \"id\" : 123,\n          \"type\" : \"transport\",\n          \"action\" : \"cluster:monitor/tasks/lists\",\n          \"start_time_in_millis\" : 1458585884904,\n          \"running_time_in_nanos\" : 236042,\n          \"cancellable\" : false\n        }\n      }\n    }\n  }\n}"
+}