1 Content-Type header [application\/x-www-form-urlencoded] is not supported
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2 https://www.elastic.co/blog/strict-content-type-checking-for-elasticsearch-rest-requests
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4 No handler for type [string] declared on field [h1]
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5 https://stackoverflow.com/questions/47452770/no-handler-for-type-string-declared-on-field-name
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7 Could not convert [language.index] to boolean
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8 https://www.elastic.co/blog/strings-are-dead-long-live-strings
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9 https://www.elastic.co/guide/en/elasticsearch/reference/5.0/breaking_50_mapping_changes.html
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11 pre_tags are set but post_tags are not set
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12 add the post_tags field
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14 Fielddata is disabled on text fields by default. Set fielddata=true on [tags] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead.
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15 change from string to keyword