Add indices API request and response examples - add block to close.

Author: szabosteve

specification/indices/add_block/IndicesAddBlockResponseExample1.yaml

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+summary: A successful response for adding an index block to an index.
+description: ''
+type: response
+response_code: 200
+value: "{\n  \"acknowledged\" : true,\n  \"shards_acknowledged\" : true,\n  \"indices\"\
+  \ : [ {\n    \"name\" : \"my-index-000001\",\n    \"blocked\" : true\n  } ]\n}"

specification/indices/analyze/indicesAnalyzeRequestExample1.yaml

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+summary: Perform analysis on a text string and returns the resulting tokens.
+method_request: GET /_analyze
+description: ''
+type: request
+value: "{\n  \"analyzer\" : \"standard\",\n  \"text\" : \"Quick Brown Foxes!\"\n}"

specification/indices/clone/indicesCloneRequestExample1.yaml

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+summary: Clone an existing index.
+method_request: POST /my_source_index/_clone/my_target_index
+description: 'The API accepts `settings` and `aliases` parameters for the target index.'
+type: request
+value: "{\n  \"settings\": {\n    \"index.number_of_shards\": 5\n  },\n  \"aliases\"\
+  : {\n    \"my_search_indices\": {}\n  }\n}"

specification/indices/close/indicesCloseResponseExample1.yaml

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+summary: A successful response for closing an index.
+description: ''
+type: response
+response_code: 200
+value: "{\n  \"acknowledged\": true,\n  \"shards_acknowledged\": true,\n  \"indices\"\
+  : {\n    \"my-index-000001\": {\n      \"closed\": true\n    }\n  }\n}"