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// src/utils/helper.js // Why are we mutating the original _source object here? // This takes away information for the end-user given by elasticsearch // My use case of ElasticSearch is to store parsed pdfs as strings // These contain 1000+ chars each // The highlighted information given by elasticsearch have many fewer characters than this. // Around 100 chars // I want to be able to send the whole of the information to the end-user in the results // If you remove this function (highlightResults) // the user still retains the highlighted information in the main result object // and the original _source information const highlightResults = (result) => { const data = { ...result }; if (data.highlight) { Object.keys(data.highlight).forEach((highlightItem) => { const highlightValue = data.highlight[highlightItem][0]; data._source = Object.assign({}, data._source, { [highlightItem]: highlightValue }); }); } return data; }; export const parseHits = (hits) => { let results = null; if (hits) { results = [...hits].map((item) => { const streamProps = {}; if (item._updated) { streamProps._updated = item._updated; } else if (item._deleted) { streamProps._deleted = item._deleted; } // no need to mutate the data! below const data = highlightResults(item); return { _id: data._id, _index: data._index, ...data._source, ...streamProps, }; }); } return results; };