[FTS] Need a way to get consistent result for evaluating index size.

http://showfast.sc.couchbase.com/#/runs/jts_fts_index_3node_1M_initial_indexsize_atlas_setupA/6.5.0-3197

Setup:

3 nodes with KV and FTS.
Index 1M document with text field.

Sample doc:

{
"text2": "estion is not replaceable 2. Image is early 1960's used as promotional and appears in multiple sites. 3. Will be used only in subjects Bio. 4. image is low-resolution ==License== Non-free fair use in|Ismael Rivera Abdallah Higazy\t11-FEB-2012 02:38:46.000\t{{Orphan|date=February 2011}} Cleanup|date=March 2008 '''Abdallah Higazy''' is a citizen of Egypt residing in the United States. He was arrested following the [[September 11, 2001 terrorist attacks]]. He alleges that the FBI threatened to torture his family unless he confessed to being involved in the attacks.<ref>cite news| url=http://www.washingtonpost.com/wp-dyn/content/article/2007/10/24/AR2007102402639.html | work=The Washington Post | first=Dan | last=Eggen | title=Second Court Ruling Redacts Information About Interrogation | date=October 25, 2007</ref> The [[United States Court of Appeals for the Second Circuit]] in Manhattan, issued a decision holding that Higazy had stated a [[5th Amendment to the United States Constitution|5th Amendment",
"text": "olin. Anarchism: A Very Short Introduction. Oxford University Press 2004 p. 62 * Goodway, David. Anarchists Seed Beneath the Snow. Liverpool Press. 2006, p. 4 * MacDonald, Dwight & Wreszin, Michael. Interviews with [[Dwight Macdonald]]. University Press of Mississippi, 2003. p. 82 * Bufe, Charles. The Heretic's Handbook of Quotations. See Sharp Press, 1992. p. iv * Gay, Kathlyn. Encyclopedia of Political Anarchy. ABC-CLIO / University of Michigan, 2006, p. 126 * [[George Woodcock|Woodcock, George]]. Anarchism: A History of Libertarian Ideas and Movements. Broadview Press, 2004. (Uses the terms interchangeably, such Anarchism\t30-APR-2012 03:25:17.000\t as on page 10) * [[Alexandre Skirda|Skirda, Alexandre]]. Facing the Enemy: A History of Anarchist Organization from Proudhon to May 1968. AK Press 2002. p. 183. * Fernandez, Frank. Cuban Anarchism. The History of a Movement. See Sharp Press, 2001, page 9.</ref> Accordingly, \"[[libertarian socialism]]\" is sometimes used as a synonym for [[socialist anarchism]],<re"
}

Every time when we run indexing, we see different size of the index created. With 6.5.0-3197, its observed that the minimum size its created is 1098M and max its created is 1373 M in different runs with same setup.

http://showfast.sc.couchbase.com/#/runs/jts_fts_index_3node_1M_initial_indexsize_atlas_setupA/6.5.0-3197

Need a way to get consistent result, so it helps for performance analysis w.r.t Index size.